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简便运算(19.4-15.8)X0.25-90x0.01
人气:226 ℃ 时间:2020-05-13 20:15:52
解答
(19.4-15.8)×0.25-90×0.01
=4.6×0.25-0.9
=4×0.25+0.6×0.25-0.9
=1+0.15-0.9
=0.25
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