（y的2次方）+（y的3次方）的2次方-2y·y的5次方
怎么做?详细一点
人气：405 ℃ 时间：2019-12-04 08:24:05
解答
y^2+(y^3)^2-2y*y^5
=y^2+y^6-2y^6
=y^2-y^6
=y^2(1-y^4)
=y^2(1+y^2)(1+y)(1-y)
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