(√5+2)^x+(√-2)^x=18
    （√5+2）^x+（√-2）^x=18
    （√5+2）^x+（√5-2）^x=18
    x^2-14.2x+46.8=0
    x^2-4x-12=0
    [x-（1/x）]^3
    （X-1/X）^3
    297X=280+150X
     3.6=81x+9
    0.28x=0.26
    x(1-x)=2x-2
    x^2+4x-2=0
    x^2-6x-3+0
    4x^2-1=0
    231x^2-2x-10
    2y^2+5y=y+2
    2x^2+1=3x
    9x^2-(x-1)^2=0
    （x-1)^2=2(x-1)
    x^2-6x+5=0

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