已知x^2-3x+1=0,求x^2+1/x^2的值

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已知x^2-3x+1=0,求x^2+1/x^2的值已知x^2-3x+1=0,求x^2+1/x^2的值已知x^2-3x+1=0,求x^2+1/x^2的值x²-3x+1=0x²+1=3

已知x^2-3x+1=0,求x^2+1/x^2的值
已知x^2-3x+1=0,求x^2+1/x^2的值

已知x^2-3x+1=0,求x^2+1/x^2的值
x²-3x+1=0x²+1=3x两边同除以xx+1/x=3(x+1/x)²=3²x²+1/x²+2=9x²+1/x²=7