(x-y)的5次方-(y-x)的2次方,
人气:151 ℃ 时间:2020-03-17 15:27:25
解答
(x-y)的5次方-(y-x)的2次方
=(x-y)的5次方-(Y-X)的2次方
〔因为A的平方=-A的平方〕
=(x-y)的3次方
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