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(x²-x+1)/x=7/6 x -1 +1/x=7/6 ∴x+1/x=13/6 兩邊平方得 x²+2+1/x²=169/36 x²+1+1/x²=133/36 ∴(x^4+x^2+1)/x^2=133/36
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