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四十乘八点二乘二点五脱式计算能简算的要简算

=40×2.5×8.2 =100×8.2 =820

1.2*2.5+0.08*25 =1.2*2.5+0.8*2.5(一个因数扩大多少倍另一个因数缩小相同的倍数积不变) =(1.2+0.8)*2.5 =2*2.5 =5

8.8×1.25 =1.1×(8×1.25) =1.1×10 =11 或者: 8.8×1.25 =(8+0.8)×1.25 =8×1.25+0.8×1.25 =10+1 =11

原式=7×0.8×0.125 =7×(0.8×0.125) =7×0.1 =0.7

9.2×9.9 =9.2×(10-0.1) =92 -0.92 =91.08

5.2×10.1 =5.2×10+5.2×0.1 =52+0.52 =52.52

7.02*1.02=(7+0.02)*(1+0.02) =7+0.14+0.02+0.0004 =7.1604

5/8x2/7+3/8x2/7 =(5/8+3/8)x2/7 =1x2/7 =2/7

原式 =1.6x7.5x1.25 =0.2x8x7.5x1.25 =(0.2x7.5)x(8x1.25) =1.5x10 =15

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