36周美国数学练习册

幼儿园到小学1年级，这里有一套最好的数学刷题练习册

幼儿园到小学1年级，这里有一套最好的数学刷题练习册（全集）_孩子

芊从一上小学以来，我就深深感受到做题速度的重要性，其实在美国幼儿园到小学，刷题也是必备内容，这些题目是必须要求孩子不假思索脱口而出的，既是应试要求，也是数学的基本功。而这套刷题练习册分的非常详细，题目也很好玩，每天做1篇，完全没有压力，但是做下来，孩子的运算水平可以提高一个台阶。

——芊妈 今天芊妈给妞说的这套刷题练习册，一共6期24本全部更新完毕啦！它是咱们《数学专栏》的5大系列之一，每期4本，分别是加法游戏和练习、减法游戏和练习，从一个加数/减数是5以内，到10以内再到20以内逐渐过渡。

每期围绕着一个阶段的加减法算式，有5种游戏、1套计时测验和1套竖式练习，娃每天做一页加法一页减法，每天都不重样，让娃即使在刷题也丝毫不会觉得枯燥。

这是全部24本刷题练习册的合照，给妞感受下它的题量↓ 芊妈建议每一期的两本练习用彩虹色的A4纸打印，这样6期正好是红橙黄绿蓝紫6色搭配，不光好看还能区分6个阶段。

它和咱们现阶段每周二的《美国数学互动笔记》是不冲突的，《刷题练习册》与《数学专栏》中的其他数学游戏和练习一样，每期都有一个核心知识点，注重让孩子在游戏中学习，同时锻炼数学思维，现在每周更新的《数学笔记》是把幼儿园到小学1年级阶段的所有数学知识点做了一个串联，把学习目标细化到每一个小练习中，形成一套完整的知识架构，更适合给幼升小的孩子做知识梳理和综合思维能力的提升。

想要了解《美国数学互动笔记》的系统学习架构的妞，请戳→美国数学课堂的互动笔记，无死角的帮孩子掌握幼儿园到小学的知识点

前面的《数学笔记》刚说完10以内的加减法工具，后面还会有20以内的加减法策略，可见加减法计算在1年级数学学习中占到相当大的比重，而且同事家上小学1年级的孩子，老师也建议每天做一页口算题。

由此可见，想要打牢计算基础，还是离不开刷题，所以在这个时候，芊妈特意给妞再推一次咱们这套《刷题练习册》，正好给娃练习口算。

Instructions: Please answer the following questions to the best of your ability. Show all work for full credit.Section 1: Number Sense1. What is the sum of 234 + 567?2. If you have 8 quarters and 3 dimes, how much money do you have in total?3. Write the following number in expanded form: 1,234.4. What is the product of 7 × 8?5. If you have 15 apples and you give 5 to your friend, how many apples do you have left?Section 2: Fractions6. Simplify the fraction 24/36.7. What is 3/4 of 16?8. If you have 1/2 of a pizza and your friend has 1/3 of the same pizza, how much pizza do you both have together?9. Draw a picture to represent the fraction 2/5.Section 3: Measurement10. Convert 5 feet to inches.11. If a ruler is 12 inches long, how many centimeters is it?12. What is the perimeter of a rectangle with a length of 8 cm and a width of 5 cm?13. If a cup holds 250 milliliters, how many cups would you need to hold 1 liter?Section 4: Geometry14. Identify the shape: a triangle, a square, a circle, or a rectangle.15. What is the area of a square with a side length of 6 cm?16. If a triangle has a base of 10 cm and a height of 5 cm, what is its area?17. Draw a line segment that is 4 units long.Section 5: Problem Solving18. Sarah has 3 times as many pencils as her brother. If her brother has 12 pencils, how many pencils does Sarah have?19. A school bus can hold 45 students. If 30 students get on the bus, how many more students can it hold?20. You have 2/3 of a pizza left. If you eat 1/3 of what's left, how much pizza will you have remaining?Section 6: Data Analysis21. You have a bag of marbles with 5 red, 7 blue, and 8 green marbles. What fraction of the marbles are green?22. Graph the following numbers on a number line: 2, 5, 8, 11, 14.23. If 40% of the students in your class like basketball, and there are 30 students in your class, how many students like basketball?Section 7: Word Problems24. John buys 3 pencils for $0.50 each and 2 erasers for $0.25 each. How much change does he get back if he pays with a $2 bill?25. There are 50 students in the school playground. If 2/5 of the students are girls, how many boys are there?26. A library has 120 books. If 1/4 of the books are science books, how many science books are there?Instructions: Please write your answers in the spaces provided. Good luck!。

美国小学数学《美国小学数学(英文版)》是上海三联书店出版的图书，是美国数学课本，是一套在西方流行了近半个世纪、至今仍在使用的经典教材。

与其他数学书相比，雷伊数学教材至少有以下几个明显特点:第一，强调在“学”中掌握“数”。

例如，《小学数学》不完全按难度分册，而是根据其实际应用范围分为四册:初级算术、智力算术、实用算术与高级算术。

让学生从对数的认知、运算法则的掌握，延伸到数学在实际生活中的广泛应用，如购物、记账、存款、利息等，并向更高的学术层次过渡。

第二，将数学问题融于文字题(Word Problem)之中。

即便最简单的加减运算，它也通过讲故事的方式呈现出来。

这样孩子们在学习数学时，不仅可以训练其数学思维，语言能力也可以同步提高。

第三，将抽象思维具体化。

书中的数学题大都结合现实事物表述出来，让孩子们理解他们所学的数学在现实生活中是如何加以应用的。

这对低年级学生来说，尤其帮助很大，他们能更快更清楚地理解那些对其年龄来讲过于抽象的数学概念。

第四，将不同学科知识融入数学问题中。

这种编写方法能让学生从数学应用的不同领域来掌握数学科学，帮助学生从低年级数学步入更复杂的数学应用领域，如几何学与会计学等。

孩子们在学习数学的同时，又能接受其他学科知识。

对于中国孩子来讲，这套数学课本不仅能教孩子学习数学，更是学习英语的很好途径，让他们换个思维学英语。

与阅读文学读本相比，这是另一种不同的感觉，或许更能激发孩子学习英语的兴趣。

数学的词汇含义固定，也易于理解记忆，孩子在解题的同时也能提高英语水平，可谓一举多得。

对于那些将来准备参加出国英语考试的学生来讲，这套书意义更大，对他们将来的求学之路应该大有帮助。

导语：数学智力测试题一直是衡量一个人逻辑思维和数学能力的重要方式。

以下精选了多道美国数学智力测试题，旨在锻炼您的思维能力，挑战您的智慧极限。

请准备好，让我们开始这场数学智力的大冒险吧！一、选择题1. 一辆火车以每小时80公里的速度行驶，如果要在1小时内追上一辆以每小时60公里速度行驶的汽车，火车需要追上多长的距离？A. 20公里B. 40公里C. 60公里D. 80公里2. 一个长方形的长是6厘米，宽是4厘米，如果长方形内切一个最大的正方形，那么这个正方形的边长是多少厘米？A. 2厘米B. 3厘米C. 4厘米D. 6厘米3. 小明有5个苹果，小红有3个苹果，他们两个人一共有多少个苹果？A. 8个B. 9个C. 10个D. 11个4. 一个篮子里有苹果、香蕉和橘子共12个，其中苹果比香蕉多4个，橘子比香蕉少2个，那么篮子里有多少个香蕉？B. 3个C. 4个D. 5个5. 一个钟表从3点开始，每过5分钟就转动一次，那么从3点到9点，钟表共转动了多少次？A. 12次B. 15次C. 18次D. 20次二、填空题6. 一个数加上它的两倍等于24，这个数是______。

7. 一个等差数列的前三项分别是2、5、8，那么这个数列的公差是______。

8. 一个圆的半径增加了50%，那么这个圆的面积增加了______。

9. 一个正方形的对角线长度是10厘米，那么这个正方形的面积是______平方厘米。

10. 一个数的平方等于81，这个数是______。

三、解答题11. 小华有一堆苹果，他每天吃掉一半再加上1个，连续吃了7天后，还剩下1个苹果。

请问小华原来有多少个苹果？12. 一个长方体的长、宽、高分别是3厘米、2厘米、1厘米，求这个长方体的体积。

13. 小明骑自行车从A地到B地，全程共20公里，他每小时骑行的速度是5公里，请问小明从A地到B地需要多长时间？14. 一个班级有男生和女生共30人，其中男生人数是女生的2倍，请问这个班级有多少名男生？15. 一个农夫有红苹果、黄苹果和绿苹果共100个，其中红苹果比黄苹果多50个，黄苹果比绿苹果多20个，请问农夫有多少个红苹果？四、应用题16. 一家商店在打折促销，打八折后的价格是原价的70%，请问原价是多少元？17. 小王有一块手表，他每天上发条后可以连续走24小时。

一、选择题（每题2分，共20分）1. 小明有5个苹果，他吃掉了3个，请问小明还剩下几个苹果？A. 2个B. 3个C. 4个D. 5个2. 下列哪个数字是偶数？A. 13B. 14C. 17D. 203. 一辆火车从A地开往B地，速度是每小时60公里，如果A地到B地的距离是240公里，火车需要多少小时才能到达B地？A. 2小时B. 3小时C. 4小时D. 5小时4. 小华有15个橘子，他给了小明5个，然后又给了小红3个，请问小华现在还剩下多少个橘子？A. 7个B. 8个C. 9个D. 10个5. 一个班级有30名学生，其中有12名女生，请问这个班级男生有多少人？B. 18人C. 20人D. 28人6. 下列哪个图形是正方形？A. 正方形B. 长方形C. 三角形D. 梯形7. 一个篮子里有3个红苹果，4个黄苹果，5个绿苹果，请问篮子里一共有多少个苹果？A. 6个B. 7个C. 8个D. 9个8. 一辆汽车以每小时80公里的速度行驶，如果它行驶了2小时，请问它行驶了多少公里？A. 160公里B. 180公里C. 200公里D. 220公里9. 下列哪个数字是质数？A. 11B. 12D. 1410. 一本书有100页，小明已经看了40页，请问小明还需要看多少页才能看完整本书？A. 60页B. 70页C. 80页D. 90页二、填空题（每题2分，共20分）11. 7 + 8 = _______12. 36 ÷ 6 = _______13. 5 × 4 = _______14. 100 - 25 = _______15. 12 ÷ 3 = _______16. 8 × 5 = _______17. 45 + 20 = _______18. 24 ÷ 8 = _______19. 50 - 30 = _______20. 7 × 7 = _______三、解答题（每题5分，共20分）21. 一家商店卖苹果，每千克10元，小明买了3千克苹果，请问小明需要支付多少钱？22. 一辆自行车每小时行驶15公里，小明骑自行车从A地到B地需要2小时，请问A地到B地的距离是多少公里？23. 一个班级有40名学生，其中男生占60%，请问这个班级男生有多少人？24. 一个长方形的长是8厘米，宽是5厘米，请问这个长方形的面积是多少平方厘米？四、应用题（每题10分，共30分）25. 小明有20个橘子，他每天吃掉2个，请问小明需要多少天才能吃掉所有的橘子？26. 一辆公交车从A站到B站，A站到B站的距离是12公里，公交车每行驶1公里需要2分钟，请问公交车从A站到B站需要多少时间？27. 一个长方体的长是10厘米，宽是6厘米，高是4厘米，请问这个长方体的体积是多少立方厘米？。

一、选择题（每题2分，共20分）1. 下列各数中，哪个数是质数？A. 17B. 20C. 28D. 352. 下列各数中，哪个数是合数？A. 7B. 11C. 15D. 193. 下列各数中，哪个数是奇数？A. 24B. 28C. 32D. 354. 下列各数中，哪个数是偶数？A. 17B. 23C. 25D. 305. 下列各数中，哪个数是正数？A. -3B. 0C. 2D. -56. 下列各数中，哪个数是负数？A. 3B. 5C. 0D. -87. 下列各数中，哪个数是整数？A. 1.5B. 2.3C. 4D. 6.78. 下列各数中，哪个数是小数？A. 10B. 15C. 0.2D. 209. 下列各数中，哪个数是正分数？A. 1/3B. 2/5C. 3/4D. 4/710. 下列各数中，哪个数是负分数？A. -1/2B. -2/3C. -3/4D. -4/5二、填空题（每题2分，共20分）11. 下列各数中，哪个数是偶数？_________12. 下列各数中，哪个数是奇数？_________13. 下列各数中，哪个数是质数？_________14. 下列各数中，哪个数是合数？_________15. 下列各数中，哪个数是正数？_________16. 下列各数中，哪个数是负数？_________17. 下列各数中，哪个数是整数？_________18. 下列各数中，哪个数是小数？_________19. 下列各数中，哪个数是正分数？_________20. 下列各数中，哪个数是负分数？_________三、解答题（每题5分，共25分）21. 求下列各数的乘积：（1）3 × 4 = _______（2）5 × 6 = _______（3）7 × 8 = _______22. 求下列各数的和：（1）8 + 9 = _______（2）10 + 11 = _______（3）12 + 13 = _______23. 求下列各数的差：（1）15 - 6 = _______（2）17 - 8 = _______（3）19 - 10 = _______24. 求下列各数的积：（1）2 × 3 × 4 = _______（2）5 × 6 × 7 = _______（3）8 × 9 × 10 = _______ 25. 求下列各数的和：（1）4 + 5 + 6 = _______（2）7 + 8 + 9 = _______（3）10 + 11 + 12 = _______答案：一、选择题：1. A2. C3. D4. D5. C6. D7. C8. C9. A10. B二、填空题：11. 2412. 3513. 1714. 2815. 216. -817. 418. 0.219. 1/320. -2/3三、解答题：21. （1）12 （2）30 （3）5622. （1）17 （2）27 （3）2523. （1）9 （2）9 （3）924. （1）60 （2）210 （3）72025. （1）17 （2）24 （3）33。

美国数学期末测试题及答案一、选择题（每题3分，共30分）1. 下列哪个选项是偶数？A. 1B. 2C. 3D. 4答案：B2. 圆的周长公式是什么？A. C = πrB. C = 2πrC. C = πdD. C = 2πd答案：B3. 如果一个数的平方根是4，那么这个数是？A. 16B. -16C. 8D. 2答案：A4. 一个直角三角形的两条直角边分别是3和4，斜边的长度是多少？A. 5B. 6C. 7D. 8答案：A5. 下列哪个数是质数？A. 2B. 4C. 6D. 8答案：A6. 一个数的立方根是2，这个数是多少？A. 4B. 8C. 6D. 2答案：B7. 一个数的绝对值是5，这个数可能是？A. 5B. -5C. 5或-5D. 0答案：C8. 以下哪个是二次方程？A. x + 3 = 0B. x^2 + 3x + 2 = 0C. x^3 - 4 = 0D. x - 5 = 0答案：B9. 一个数的倒数是1/3，这个数是多少？A. 3B. 1/3C. 1D. 3/1答案：A10. 一个数的平方是16，这个数可能是？A. 4B. -4C. 4或-4D. 0答案：C二、填空题（每题2分，共20分）11. 一个数的平方是36，这个数是________。

答案：±612. 两个连续整数的和是9，这两个数是________和________。

答案：4，513. 如果一个三角形的底是10，高是6，那么它的面积是________。

答案：3014. 一个数的立方是-27，这个数是________。

答案：-315. 如果一个数的绝对值是7，这个数可能是________或________。

答案：7，-716. 一个数的平方根是5，这个数的平方是________。

答案：2517. 一个数的倒数是2，这个数是________。

答案：1/218. 一个数的平方是9，这个数是________或________。

SAMPLE QUESTION FOR 3 POINTSAlice draws a figure connecting all the ladybugs in the order of increasing number of dots. She starts with the ladybug with one dot. Which figure will she get?SAMPLE QUESTION FOR 4 POINTSPeter drew a pattern twice, as in the picture. Which point will he reach when he draws the third pattern?A) A B) B C) C D) D E) ESAMPLE QUESTION FOR 5 POINTSThe number of dwarfs that can fit under a mushroom is equal to the number of dots on the mushroom cap. The picture below shows one side of each mushroom. The number of dots on the other side is the same. If 30 dwarfs are seeking shelter from the rain, how many dwarfs will get wet?A) 2 B) 3 C) 4 D) 5 E) 6SAMPLE QUESTION FOR 3 POINTSAlice draws a figure connecting all the ladybugs in the order of increasing number of dots. She starts with the ladybug with one dot. Which figure will she get?SAMPLE QUESTION FOR 4 POINTSPeter drew a pattern twice, as in the picture. Which point will he reach when he draws the third pattern?A) A B) B C) CD) DE) ESAMPLE QUESTION FOR 5 POINTSThe number of dwarfs that can fit under a mushroom is equal to the number of dots on themushroom cap. The picture below shows one side of each mushroom. The number of dots on the other side is the same. If 30 dwarfs are seeking shelter from the rain, how many dwarfs will get wet?A) 2 B) 3 C) 4 D) 5E) 6SAMPLE QUESTION FOR 3 POINTSThe picture shows 3 arrows that are flying and 9 balloons that can't move. When an arrow hits a balloon, the balloon pops, and the arrow keeps flying in the same direction. How many balloons will be hit by the flying arrows?A) 2 B) 3 C) 4 D) 5 E) 6SAMPLE QUESTION FOR 4 POINTSToby glues 10 cubes together to make the structure shown to the right. He paints the whole structure, even the bottom. How many cubes are painted on exactly 4 of their faces?A) 6 B) 7 C) 8 D) 9 E) 10SAMPLE QUESTION FOR 5 POINTSLeon wants to write the numbers from 1 to 7 in the grid shown. Two consecutive numbers cannot be written in two neighboring cells. Neighboring cells are those that meet at the edge or at a corner. What numbers can he write in the cell marked with the question mark?A) all seven numbersB) all of the odd numbersC) all of the even numbersD) only the number 4E) only the numbers 1 or 7SAMPLE QUESTION FOR 3 POINTSThe picture shows 3 arrows that are flying and 9 balloons that can't move. When an arrow hits a balloon, the balloon pops, and the arrow keeps flying in the same direction. How many balloons will be hit by the flying arrows?A) 2 B) 3 C) 4 D) 5 E) 6SAMPLE QUESTION FOR 4 POINTSToby glues 10 cubes together to make the structure shown to the right. He paints the whole structure, even the bottom. How many cubes are painted on exactly 4 of their faces?A) 6 B) 7 C) 8D) 9 E) 10SAMPLE QUESTION FOR 5 POINTSLeon wants to write the numbers from 1 to 7 in the grid shown. Two consecutive numbers cannot be written in two neighboring cells. Neighboring cells are those that meet at the edge or at a corner. What numbers can he write in the cell marked with the question mark?A) all seven numbersB) all of the odd numbersC) all of the even numbersD) only the number 4E) only the numbers 1 or 7SAMPLE QUESTION FOR 3 POINTSAlice subtracted two 2-digit numbers. Then she paintedtwo cells. What is the sum of the two digits in the painted cells?A)8 B) 9 C) 12 D) 13 E) 15SAMPLE QUESTION FOR 4 POINTSEmily wants to enter a number into each cell of the triangular table. The sum of the numbers in any two cells with a common edge must be the same. She has already entered two numbers. What is the sum of all the numbers in the table?A) 18 B) 20 C) 21 D) 22 E) impossible to determineSAMPLE QUESTION FOR 5 POINTSFive balls, A, B, C, D, and E, weigh 30 g, 50 g, 50 g, 50 g, and 80 g each, not necessarily in that order. Which ball weighs 30 g?A) A B) B C) C D) D E) ESAMPLE QUESTION FOR 3 POINTSAlice subtracted two 2-digit numbers. Then she painted two cells. What is the sum of the two digits in the painted cells?B)8 B) 9 C) 12 D) 13E) 15SAMPLE QUESTION FOR 4 POINTSEmily wants to enter a number into each cell of the triangular table. The sum of the numbers in any two cells with a common edge must be the same. She has already entered two numbers. What is the sum of all the numbers in the table?A) 18 B) 20 C) 21D) 22 E) impossible to determineSAMPLE QUESTION FOR 5 POINTSFive balls, A, B, C, D, and E, weigh 30 g, 50 g, 50 g, 50 g, and 80 g each, not necessarily in that order. Which ball weighs 30 g?A) A B) B C) C D) D E) ESAMPLE QUESTION FOR 3 POINTSWhen the letters of the word MAMA are written vertically above one another, the word has a vertical line of symmetry. Which of these words also has a vertical line of symmetry when written in the same way?A) ROOT B) BOOM C) BOOT D) LOOT E) TOOTSAMPLE QUESTION FOR 4 POINTSA rectangle is divided into 40 identical squares. The rectangle contains more than one row of squares. Andrew found the middle row of squares and colored it in. How many squares did he not color?A) 20 B) 30 C) 32 D) 35 E) 39SAMPLE QUESTION FOR 5 POINTSDomino tiles are said to be arranged correctly if the number of dots at the ends that touch are the same. Peter laid six dominoes in a line as shown in the diagram. He can make a move by either swapping the position of any two dominoes or by rotating one domino. What is the smallest number of moves he needs to make to arrange all the tiles correctly?A) 1 B) 2C) 3D) 4E) It is impossible to do.SAMPLE QUESTION FOR 3 POINTSWhen the letters of the word MAMA are written vertically above one another, the word has a vertical line of symmetry. Which of these words also has a vertical line of symmetry when written in the same way?A) ROOT B) BOOM C) BOOT D) LOOT E) TOOTSAMPLE QUESTION FOR 4 POINTSA rectangle is divided into 40 identical squares. The rectangle contains more than one row of squares. Andrew found the middle row of squares and colored it in. How many squares did he not color?A) 20 B) 30 C) 32 D) 35 E) 39SAMPLE QUESTION FOR 5 POINTSDomino tiles are said to be arranged correctly if the number of dots at the ends that touch are the same. Paulius laid six dominoes in a line as shown in the diagram. He can make a move by either swapping the position of any two dominoes or by rotating one domino. What is the smallest number of moves he needs to make to arrange all the tiles correctly?A) 1 B) 2C) 3D) 4E) It is impossible to do.SAMPLE QUESTION FOR 3 POINTSIn my family each child has at least two brothers and at least one sister. What is the smallest possible number of children in my family?A) 3 B) 4 C) 5 D) 6 E) 7SAMPLE QUESTION FOR 4 POINTSEight congruent semicircles are drawn inside a square with a side length of 4. What is the area of the non-shaded part of the square?A) 2πB) 8 C) 6 + πD) 3π– 2 E) 3πSAMPLE QUESTION FOR 5 POINTSDiana draws a rectangular grid of 12 squares on squared paper. Some of the squares are painted black. In each blank square she writes the number of black squares that share a side with it. The figure shows an example. Now she does the same in a rectangular grid with 2018 squares. What is the maximum value that she can obtain as the result of the sum of all the numbers in the grid?A) 1262 B) 2016 C) 2018 D) 3025 E) 3027SAMPLE QUESTION FOR 3 POINTSIn my family each child has at least two brothers and at least one sister. What is the smallest possible number of children in my family?A) 3 B) 4 C) 5D) 6 E) 7SAMPLE QUESTION FOR 4 POINTSEight congruent semicircles are drawn inside a square with a side length of 4. What is the area of the non-shaded part of the square?A) 2πB) 8C) 6 + πD) 3π– 2 E) 3πSAMPLE QUESTION FOR 5 POINTSDiana draws a rectangular grid of 12 squares on squared paper. Some of the squares are painted black. In each blank square she writes the number of black squares that share a side with it. The figure shows an example. Now she does the same in a rectangular grid with 2018 squares. What is the maximum value that she can obtain as the result of the sum of all the numbers in the grid?A) 1262 B) 2016 C) 2018 D) 3025E) 3027LEVELS 11 AND 12SAMPLE QUESTION FOR 3 POINTSThe figure shows the floor plan of Renate's house. Renate enters her house from the porch and walks through each door exactly once. In which room does she end up?A) 1 B) 2 C) 3 D) 4 E) 5SAMPLE QUESTION FOR 4 POINTSA vase is filled up to the top with water, at a constant rate. The graph shows the height h of the water as a function of time t.Which of the following can be the shape of the vase?A) B) C) D) E)SAMPLE QUESTION FOR 5 POINTSThere are 40% more girls than boys in a class. How many pupils are in this class if the probability that a two-person delegation selected at random consists of a girl and a boy equals 1/2?A) 20 B) 24 C) 36 D) 38 E) This situation is not possible.LEVELS 11 AND 12 ANSWERSSAMPLE QUESTION FOR 3 POINTSThe figure shows the floor plan of Renate's house. Renate enters her house from the porch and walks through each door exactly once. In which room does she end up?A) 1 B) 2C) 3 D) 4 E) 5SAMPLE QUESTION FOR 4 POINTSA vase is filled up to the top with water, at a constant rate. The graph shows the height h of the water as a function of time t.Which of the following can be the shape of the vase?B) B) C) D) E)SAMPLE QUESTION FOR 5 POINTSThere are 40% more girls than boys in a class. How many pupils are in this class if the probabilitythat a two-person delegation selected at random consists of a girl and a boy equals 1/2?A) 20 B) 24 C) 36D) 38 E) This situation is not possible.。

一、选择题（每题4分，共40分）1. 下列数中，是整数的是（）A. √4B. 2.5C. √9D. √162. 已知等腰三角形的底边长为10cm，腰长为8cm，那么这个三角形的周长是（）A. 24cmB. 26cmC. 28cmD. 30cm3. 一个长方体的长、宽、高分别为4cm、3cm、2cm，那么它的体积是（）A. 24cm³B. 48cm³C. 72cm³D. 96cm³4. 下列函数中，是奇函数的是（）A. y = x²B. y = x³C. y = |x|D. y = x² + 15. 下列不等式中，正确的是（）A. 2x + 3 < 5x - 2B. 3x - 2 > 2x + 1C. 4x + 5 ≤ 3x + 6D. 2x - 3 ≥ 5x - 86. 下列数中，是素数的是（）A. 37B. 39C. 41D. 437. 一个等差数列的前三项分别为3、5、7，那么它的第四项是（）A. 9B. 10C. 11D. 128. 下列图形中，面积最大的是（）A. 正方形B. 长方形C. 等腰三角形D. 梯形9. 下列数中，是偶数的是（）A. 5²B. 7²C. 9²D. 11²10. 下列函数中，是单调递增函数的是（）A. y = x²B. y = 2xC. y = x³D. y = -x二、填空题（每题4分，共20分）11. 若一个数是2的3次方，则这个数是（）12. 一个圆的半径是5cm，那么这个圆的周长是（）cm。

13. 已知一个数的平方是100，则这个数是（）。

14. 下列数中，是正数的是（）。

15. 若一个等差数列的首项是2，公差是3，那么这个数列的第10项是（）。

三、解答题（每题10分，共30分）16. 解下列一元一次方程：2x - 3 = 5x + 4。