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6.86乘【负5】加6.86乘【负12】加6.86乘【正17】,等于几等于几.等于几.
人气:480 ℃ 时间:2020-01-25 17:35:34
解答
=-6.86×5-6.86×12+6.86×17
=6.86×(-5-12+17)
=6.86×0
=0
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