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0·125x7.5的简便方法

0·125x7.5 =0.125×(7-0.5) =0.125×8-0.125×0.5 =1-0.0625 =0.9375

2.5x=0.125*8 2.5x=1 x=0.4

(10-7.5)X=0.125×8 2.5X=1 X=1÷2.5 X=0.4

解:2.5x=1 x=1÷2.5 x=0.4

去括号得: 2.5x=1 系数化为一得: x=0.4

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