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2.6×11.9-19×26%怎样简便计算
人气:448 ℃ 时间:2019-12-10 00:26:54
解答
2.6×11.9-19×26%
=2.6×11.9-19×0.26
=0.26×119-19×0.26
=0.26×(119-19)
=0.26×100
=26
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