写纸上发图
来源:学生作业帮 编辑:灵鹊做题网作业帮 分类:数学作业 时间:2024/06/17 05:37:08
写纸上发图
![](http://img.wesiedu.com/upload/f/c1/fc1ebd0e33b3908a9d9d7035bd3d11f3.jpg)
![](http://img.wesiedu.com/upload/f/c1/fc1ebd0e33b3908a9d9d7035bd3d11f3.jpg)
![写纸上发图](/uploads/image/z/16817584-40-4.jpg?t=%E5%86%99%E7%BA%B8%E4%B8%8A%E5%8F%91%E5%9B%BE%26nbsp%3B)
(x+1/x)²=x²+2+1/x²=9
x²+1/x²=7
(x-1/x)²=x²-2+1/x²=7-2=5
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x²-x-2=0且x²+2x+1≠0
(x-2)(x+1)=0且(x+1)²≠0
x=2
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a/(a+1)²+1/(a+1)²=(a+1)/(a+1)²=1/(a+1)=1/(1+1/2)=2/3
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x²-1=0且x+1≠0
(x-1)(x+1)=0且x≠-1
x=1
![](http://img.wesiedu.com/upload/1/10/110e62a16ad5b28c1d1f7f303af44542.jpg)
x²+1/x²=7
(x-1/x)²=x²-2+1/x²=7-2=5
-------------------------
x²-x-2=0且x²+2x+1≠0
(x-2)(x+1)=0且(x+1)²≠0
x=2
-------------------------
a/(a+1)²+1/(a+1)²=(a+1)/(a+1)²=1/(a+1)=1/(1+1/2)=2/3
-------------------------
x²-1=0且x+1≠0
(x-1)(x+1)=0且x≠-1
x=1
![](http://img.wesiedu.com/upload/1/10/110e62a16ad5b28c1d1f7f303af44542.jpg)