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1、 x^2+1=3x 兩邊平方 x^4+2x^2+1=9x^2 x^4+1=7x^2 兩邊除以x^2 x^2+1/x^2=7 2、 x^4+1=7x^2 兩邊平方 x^8+2x^4+1=49x^4 x^8+1=47x^4 兩邊除以x^4 x^4+1/x^4=7
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