Thanks各位学霸门

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Thanks各位学霸门Thanks各位学霸门 Thanks各位学霸门x^2+1/x^2=(x+1/x)^2-2=2^2-2=2

Thanks各位学霸门
Thanks各位学霸门

Thanks各位学霸门
x^2+1/x^2=(x+1/x)^2-2=2^2-2=2

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