作业帮Who 来救我(一课一练七年级的暑期作业)(x+1)^4+(x^-1)^+(x-1)^4
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Who 来救我(一课一练七年级的暑期作业)(x+1)^4+(x^-1)^+(x-1)^4
Who 来救我(一课一练七年级的暑期作业)
(x+1)^4+(x^-1)^+(x-1)^4
Who 来救我(一课一练七年级的暑期作业)(x+1)^4+(x^-1)^+(x-1)^4
题目抄错了吧
(x+1)^4+(x^-1)^+(x-1)^4=(x^-1)^(不知道几次方）
(x^-1)^=(x^2-1)^2?
(x+1)^4+(x^2-1)^2+(x-1)^4
=(x+1)^4+[(x-1)(x+1)]^2+(x-1)^4
=[(x+1)+(x-1)]^2-(x^2-1)^2
=[2x+(x^2-1)][2x-(x^2-1)]
=-(x-1)^2*(x^2+2x-1)
题目完全错误
恩,楼主题错了
就是，几次方都没标清。
(x+1)的平方 乘以(5x+1) 貌似是这样的
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