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数学
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{{..Easy的Maths problem..]]
|X-Y|-|Y-X|=?
人气:269 ℃ 时间:2020-02-05 15:49:51
解答
|X-Y|-|Y-X|
=X-Y-(X-Y)=0
无论x大还是Y大,绝对值总是相等,相减=0
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