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简便计算:72*55+28*56=( )
人气:498 ℃ 时间:2019-12-13 16:46:58
解答
刘晶美,
72×55+28×56
=72×55+28×55+28
=55×(72+28)+28
=55×100+28
=5500+28
=5528
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