4.7乘1.25乘1.6 =4.7*12.5*8*0.2 =(1.25*8)*(4.7*0.2) =10*0.94 =9.4 0.52乘105 =0.52*(100+5) =0.52*100+0.52*5 =52+2.6 =54.6
4.7乘1.25乘1.6 0.52乘105 的简便运算则么算
4.7乘1.25乘1.6 =4.7*12.5*8*0.2 =(1.25*8)*(4.7*0.2) =10*0.94 =9.4 0.52乘105 =0.52*(100+5) =0.52*100+0.52*5 =52+2.6 =54.6