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简算:7.89×17-78.9×0.9+789×0.02
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简算:7.89×17-78.9×0.9+789×0.02
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答案和解析
7.89*17-78.9*0.9+789*0.02
=7.89*17-7.89*9+7.89*2
=7.89*(17-9+2)
=7.89*10
=78.9
=7.89*17-7.89*9+7.89*2
=7.89*(17-9+2)
=7.89*10
=78.9
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