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计算(-3/2)-(-5/4)-(+7/2)-(21/4)+(9/4)
要有计算过程
人气:173 ℃ 时间:2020-05-29 05:17:16
解答
(-3/2)-(-5/4)-(+7/2)-(21/4)+(9/4)
=-3/2+5/4-7/2-21/4+9/4
=(-3/2-7/2)+(9/4+5/4-21/4)
=-5-7/4
=-6又3/4
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