x^+x-1=0,求x^+1/x^等于几?
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x^+x-1=0,求x^+1/x^等于几?x^+x-1=0,求x^+1/x^等于几?x^+x-1=0,求x^+1/x^等于几?x^+x-1=0可得x-1/x=-1两边平方得x^+1/x^-2=1所以,
x^+x-1=0,求x^+1/x^等于几?
x^+x-1=0,求x^+1/x^等于几?
x^+x-1=0,求x^+1/x^等于几?
x^+x-1=0
可得
x-1/x=-1
两边平方得
x^+1/x^-2=1
所以,
x^+1/x^=3
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