7.8*0.29+0.51*12.5+4.7*0. - 知识问答

7.8*0.29+0.51*12.5+4.7*0.29怎么巧算

2个回答

7.8*0.29+0.51*12.5+4.7*0.29
=7.8*0.29+4.7*0.29+0.51*12.5
=（7.8+4.7）*0.29+0.51*12.5
=0.29*12.5+0.51*12.5
=（0.29+0.51）*12.5
=0.8*12.5
=10

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