-ln(x-1)/x^2+1/(x-1)x
    （9+x）（9+x）+（5＋x）（5＋x）＝（14＋x）（14＋x）
    q^3-21q+20=0
    q^3-21q+21=20
    （24×0.8^2）/sqrt（1-x^6）
    7.834955x^0.2-x=7.834955*8.096049^0.2-8.096049
    78.34955*0.2x^0.2+x=20
    45t^2+40—100=0
    39.174775*0.2x^0.2+x=20
    x+0.7x^（1/1.13）=20
    （x-2）（3x-5）=1
    （x-2）（3x-2）=1
    2x*x-5x+1
    x=-lg1/9
    4.5^2+(6-2*t)^2=4*t^2
    50-x=0.18x
    lgx=-0.756
    lg (50-x)/x=-0.756
    lg(50-x)=-0.756
    4.756+lg(50-x)/x=4.0

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