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1.25乘0.4x8x2.5简算

=(0.4×2.5)×(1.25×8) =1+10 =11

12.5x0.76x0.4×8x2.5 = (12.5x8)x0.76x(0.4x2.5) = 10x0.76x1 = 7.6

=0.4×2.5×0.8 =1×0.8 =0.8 乘法的交换律

0.4x+7.5=15 x=(15-7.5)/0.4 =7.5/0.4 =18.75 8x-12=52 x=(52+12)/8 =64/8 =8

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