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(-270)*0.25+0.25*21.5+(-8.5)*(-0.25)=?
人气:234 ℃ 时间:2020-03-04 20:07:18
解答
(-270)*0.25+0.25*21.5+(-8.5)*(-0.25)
=0.25x(-270+21.5+8.5)
=0.25x-240
=0.25x4x-60
=-60
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