来自林良明的问题
计算7.5*2.3+2.9*2.5+12.5*0.4怎样算简便?
计算7.5*2.3+2.9*2.5+12.5*0.4怎样算简便?
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2020-03-03 00:13
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李立芳
=2.5x6.9+2.9x2.5+2.5x2
=2.5x（6.9+2.9+2)
=2.5x11.8
=2.5x2x5.9
=29.5
2020-03-03 00:17:31