求化简(X+1)^3
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解决时间 2021-11-24 07:22
- 提问者网友:嗝是迷路的屁
- 2021-11-24 02:45
求化简(X+1)^3
最佳答案
- 五星知识达人网友:詩光轨車
- 2021-11-24 04:00
(x+1)-[(x+3)/(x^2-1)]*[(x^2+1)/(x^2+4x+3)]
=(x+1)-[(x+3)/(x+1)(x-1)]*[(x^2+1)/(x+1)(x+3)]
=(x+1)-[1/(x+1)(x-1)]*[(x^2+1)/(x+1)]
=(x+1)-(x^2+1)/[(x+1)^2*(x-1)]
=[(x+1)^3*(x-1)]/[(x+1)^2*(x-1)]-(x^2+1)/[(x+1)^2*(x-1)]
通分后,分子上:
[(x+1)^3*(x-1)]-(x^2+1)
=[(x+1)^2*(x^2-1)]-(x^2+1)
=(x^2+2x+1)*(x^2-1)-(x^2+1)
=x^4-1+2x(x^2-1)-x^2-1
=x^4+2x^3-x^2-2x-2
好像不能化简了吧
=(x+1)-[(x+3)/(x+1)(x-1)]*[(x^2+1)/(x+1)(x+3)]
=(x+1)-[1/(x+1)(x-1)]*[(x^2+1)/(x+1)]
=(x+1)-(x^2+1)/[(x+1)^2*(x-1)]
=[(x+1)^3*(x-1)]/[(x+1)^2*(x-1)]-(x^2+1)/[(x+1)^2*(x-1)]
通分后,分子上:
[(x+1)^3*(x-1)]-(x^2+1)
=[(x+1)^2*(x^2-1)]-(x^2+1)
=(x^2+2x+1)*(x^2-1)-(x^2+1)
=x^4-1+2x(x^2-1)-x^2-1
=x^4+2x^3-x^2-2x-2
好像不能化简了吧
全部回答
- 1楼网友:你可爱的野爹
- 2021-11-24 05:07
x的三次方+3x平方+3x+1
8x三次方+36x平方+54x+27追问8x三次方+36x平方+54x+27 的“36” 是 怎么来的 啊 ? 比如 27 是由 3^3
8x三次方+36x平方+54x+27追问8x三次方+36x平方+54x+27 的“36” 是 怎么来的 啊 ? 比如 27 是由 3^3
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