作业帮写纸上发图
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/30 09:52:04
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写纸上发图
写纸上发图
写纸上发图
(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
