8.9×0.045+0.89×0.42+0.089×1.3 如何简便计算

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8.9×0.045+0.89×0.42+0.089×1.3如何简便计算8.9×0.045+0.89×0.42+0.089×1.3如何简便计算8.9×0.045+0.89×0.42+0.089×1.3如

8.9×0.045+0.89×0.42+0.089×1.3 如何简便计算
8.9×0.045+0.89×0.42+0.089×1.3 如何简便计算

8.9×0.045+0.89×0.42+0.089×1.3 如何简便计算
=0.089×(4.5+4.2+1.3)
=0.089×10
=0.89

0.89*0.45+0.89*0.42+0.89*0.13

原式=89X0.0045+89X0.0042+89+0.0013=89X(0.0045+0.0042+0.0013)=89X0.0001X(45+42+13)=89X0.0001X100=89X0.01=0.89
望采纳谢谢

=8.9*0.045+8.9*0.042+8.9*0.013=8.9*(0.045+0.042+0.013)=8.9*0.1=0.89

问问你爸