1、直接写出得数。
0.45×2.5＝0.8×1.25＝0.3×3.6＝0.3×0.3＝10×0.07＝0.3×1.4＝0.05×7＝0.92×0.4＝0.2×0.26＝0.14×4＝0.02×0.1＝ 1.2×0.3＝0.2×0.4＝8.2＋1.8＝100－35.22＝ 2.3×4＝2.5×0.4＝ 2.4×5＝0.22×4＝ 3.25×0＝0.9－0.52＝ 3.99×1＝0×3.52＝12.5×8＝
8÷10 = 10-1.8-7.2= 0.43+3.57= 2.5×4×12= 0.9×0.8= 7.5x-3x = 1.05×100= 1÷0.5=
0.96÷3= 1.47÷0.7= 5.4÷6=
0.16.5×10= 0.56×100= 3.78×100= 4÷0.8 =
3.215×100= 0.8×10=
4.08×100= 1.1×0.2 = 0.6×0.8 = 3×0.9= 2.5×0.4= 3.6×0.4=
12.5×8= 50×0.04= 80×0.3 = 1.1×9=
0.16×5 ＝ 1.78＋2.2 = 9.6÷0.6 = 1.2×0.5-0.4 =
0.7÷0.01 = 2.5×0.4 = 12－3.9= 1.25×8÷1.25 =
6.6÷0.66 = 5.37×0+4.63 = 3.9＋2.03＝ 4.2÷3.5＝
1.6+
2.4×0.3 = 2.14－0.9＝27＋456＋73= 0.3×0.3=
7.2＋2.8＝0.9÷0.01＝12÷0.3= 2.87÷0.7＝
13÷4＝0.96÷0.3＝ 1.5×0.4＝7÷0.25＝
2.5×0.7×0.8= 8－2.5＝16÷1.6＝ 5.6×1.01=
8×（2.5＋0.25）＝0.36＋0.64＝64.32÷16＝ 4.2÷0.1＝
72.8÷0.8＝8.4÷4.2＝13.8＋9.9＝ 2.4×2.5＝
0.05×0.8＝ 2.56－0.37＝ 1.25×0.8×0.5＝12×2.5＝ 1.23×3＝3.2÷1.6＝ 3.5＋3.5×3＝19.6÷2＝8.8÷2.2= 0.75×4＝
（1.5＋0.25）×4＝0.5×0.8=
8.4×0.2= 1.6×0.2＝7.2×0.3= 2.8×0.3＝0.9÷0.15=
1.8×0.4= 5.5÷0.55= 0.08×100=
2.2÷0.11= 5.46＋4.54= 12.5×0.8= 0.35×0.3=
1.4×5=
2.8×4= 19.6÷4= 22.5×4=
2、用竖式计算
0.396÷1.2= 0.756÷0.36= 15.6×13=
0.18×15= 0.025×14= 3.06×36=
0.04×0.12＝ 3.84×2.6≈ 5.76×3＝
（保留一位小数）
16.9÷0.13 1.55÷3.9 3.7×0.016
13.76×0.8= 5.2×0.6 8.4×1.3
6.4×0.5 4.48×0.4 5.25×5
35.4×4.2 0.042×0.54 0.76×0.32
0.25×0.046 2.52×3.4 1.08×25
0.12×0.5×0.16＝ 4.8×0.25＝0.125×1.4≈
（保留两位小数）
2.5÷0.7= （保留三位小数）10.1÷
3.3= （商用循环小数）
10.75÷12.5= （用乘法验算） 3.25×9.04= （用除法验算）
3、脱式计算（能简算的要简算）
2.5×7.1×4 16.12×99＋16.12 5.2×0.9＋0.9
7.28×99+7.28 4.3×50×0.2 64－2.64×0.5
26×15.7＋15.7×24 (2.275 ＋0.625)×0.28
3.94+3
4.3×0.2 1.2×(9.6÷2.4)÷4.8
8.9×1.1×4.7 2.7×5.4×3.9 3.6×9.85-5.46
8.05×3.4+7.6 6.58×4.5×0.9 2.8×0.5+1.58
32＋4.9－0.9 4.8－4.8×0.5 (1.25－0.125)×8 4.8×100.1 56.5×99＋56.5 7.09×10.8－0.8×7.09 4.85 + 0.35 ÷ 1.4 8.7 × 17.4 - 8.7 × 7.4
12.5×0.4×2.5×8 0.87×3.16+4.64 9.5×101
0.68 ÷（5.2 -3.5）× 1.25
40.5 ÷ 0.81 × 0.18 4.8 ×（15 ÷ 2.4）2．13.×0.×8257 6.81+6.81×99 0.25×185×40 4.4×0.8－3.4×0.8 (9.37+9．37+9．37+9．37)× 2．5 4．2.×1.＋1.×1.75
2.37×6.3+2.37×
3.7 2.5×1.25×0.32 3.8×10.1
2.5×(
3.8×0.04) 7.69×101 3.8×10.1 0.25×39+0.25 0.125×72 46×0.33+54×0.33 (8×5.27) ×1.25 6.81+6.81×99 0.25×185×40 6.8×0.75÷0.5 3.75÷0.125–2.75 1.53+23.4÷7.2
9.5×99 13.5×0.98 12.5×8.8
二、解方程：
54-X=24 7X=49 126÷X=42 13+A=28.5 2.4X=26.4 7.5x－3x=18
