已知x+1/X=8则X²+1/X²=?
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已知x+1/X=8则X²+1/X²=?
已知x+1/X=8则X²+1/X²=?
已知x+1/X=8则X²+1/X²=?
x²+1/x²
=x²+2+1/x²-2
=(x+1/x)²-2
=8²-2
=64-2
=62
x+1/X=8
平方得 x^2+2+1/x^2=64
∴x^2+1/x^2=64-2=62