8X=（X+8）+（6X+48）
    7X=（X+8）*6
    7X=（X+8）/6
    x^2+10cos（x）=0
    1/8 x+8=1/7 x
    0.692x²+1200x-198192＝0
    （0.3-x）（0.25-x）=2.717+27.17x
    0.05x/(10+x)^2＝1.77*10^-10
    0.005*x^2＝(10+x)^3*2*10^-7
    0.005x^2＝(10+x)^3*2*10^-7
    x²-7x+30=30
    x²-7x+30=0
    4.5x减0.6x等于0.78
    x^2+x+1
    X/(462.63+X)=0.15
    27000=2300x
    (-9000+1000x)/(1000x)=130%
    (1000x -9000)/1000x=130%
    200*x=130
    (18000+9000-1000x)/(1000x)=30%

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