六年级数学上册7.3百分数的应用(三)练习题北师大版(new)
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百分数的应用(三)
填一填。
(1)甲数是72,乙数是甲数的60%,乙数是()。
(2)一批零件,已经完成了60%,还剩下80箱,这批零件一共有()箱。
2.解方程。
(1)60%X+25=40
(2)19—120%X=7
(3)X+30%X=52
(4)X-10%X=18
(5)(1-25%)X=36
(6)2X+30%X=9.2
3.家具厂上半年生产家具500件,下半年生产的家具比上半年多60%,。下半年生产家具多少件?
4.一种收音机现在七五折出售,每台降价7。5元,原来每台收音机的售价是多少元?
5.一辆汽车从甲地开完乙地,第一小时行了全程的30%,第二小时行了全程的25%,比第一小时少行的5千米。甲、乙两地间的公路长是多少千米?
6.有一块圆形铁皮,半径是20厘米,前去这块铁皮的40%,还剩下多少平方厘米?
答案:
1.(1)43。2 (2)200
2.(1)X=25 (2)X=10 (3)X=40 (4)X=20 (5)X=48 (6)X=4
3. 800件
4. 30元
5. 100千米
6. 753.6平方厘米
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