12.5乘以0.25再乘以64怎样算简便

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12.5乘以0.25再乘以64怎样算简便
12.5乘以0.25再乘以64怎样算简便

12.5乘以0.25再乘以64怎样算简便
12.5×0.25×64
=12.5×8×0.25×4×2
=100×1×2
=200

12.5×0.25×64
=(12.5×8)×(0.25×8)
=100×2
=200

12.5*（0.25*64）
=12.5*16=200

12.5/4*64=12.5*16=12.5*10+12.5*6=125+75=200

12.5*0.25*64
=12.5*8*0.25*4*2
=100*1*2
=200;

12.5=5X2.5, 2.5等于4分之10；0.25等于4分之1；
64=4X4X4
所以=5X4X10/4X4X1/4X4=200

用分数算，12.5=二分之25,0.25=四分之一，64除八再乘25

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