杭州水利水电学院几本:1.6乘7.8乘1.25的简便方法怎么做
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1.6乘7.8乘1.25的简便方法怎么做
=1.25*8*0.2*7.8
=10*1.56
=15.6
乘法分配率
1.6*7.8*1.25
=0.2*(8*1.25)*7.8
=0.2*10*7.8
=2*7.8
=15.6
1.6*7.8*1.25
=0.2*(8*1.25)*7.8
=0.2*10*7.8
=2*7.8
=15.6
0.4×4×7.8×1.25