(a-b)³×（a-b）²=?(x-y)×（y-x)³=?
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(a-b)³×（a-b）²=?(x-y)×（y-x)³=?(a-b)³×（a-b）²=?(x-y)×（y-x)³=?(a-b)³×
(a-b)³×（a-b）²=?(x-y)×（y-x)³=?
(a-b)³×（a-b）²=?(x-y)×（y-x)³=?
(a-b)³×（a-b）²=?(x-y)×（y-x)³=?
(a-b)³×（a-b）²
=(a-b)^5
(x-y)×（y-x)³
=(x-y)×(-(x-y)³)
=-(x-y)^4
(a-b)³×（a-b）²=(a-b)^5
(x-y)×（y-x)³=-(x-y)^4