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12.5*15+12.5*57简便计算
人气:423 ℃ 时间:2020-04-15 21:21:18
解答
12.5*15+12.5*57
=12.5*(15+57)
=12.5*72
=12.5*(80-8)
=12.5 *80-12.5*8
=1000-100
=900
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