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0-1/2-(+2/5)-(-3/4)-(+1/4)等于多少?
人气:107 ℃ 时间:2020-02-06 09:33:00
解答
0-1/2-(+2/5)-(-3/4)-(+1/4)
=0-1/2-2/5+3/4-1/4
=(3/4-1/2-1/4)-2/5
=0-2/5
=-2/5
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