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14x2.5+2.5x(11.28+2.72)怎样简便就怎样计算
人气:465 ℃ 时间:2020-02-06 08:33:13
解答
14x2.5+2.5x(11.28+2.72)
=14x2.5+2.5x14
=2x2.5x14
=5x14
=70
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