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2.9*0.45+0.29*4.2+0.029*13怎样用简便方法
人气:320 ℃ 时间:2020-03-22 13:54:07
解答
2.9*0.45+0.29*4.2+0.029*13
=2.9*0.45+2.9*0.42+2.9*0.13
=2.9*(0.45+0.42+0.13)
=2.9*1
=2.9
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