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38.2*7.5+75+0.75*518=750怎么巧算?
人气:263 ℃ 时间:2020-06-19 18:15:12
解答
=38.2*7.5 + 7.5*10 + 7.5*51.8
=7.5*(38.2+10+51.8)
=7.5*100
=750
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