(x3-11x)/25=x
    2*x*x*x-11*x*x+18*x-5=0
    （7113-X）/8=x+450
    0.005=0.137x^(-3)+0.119x^(-2)+0.269x^(-1)-0.019
    (36－2x)(20－x)＝576
    300÷X-300÷（1.5-X）=300
    0.02=0.137x^(-3)+0.119x^(-2)+0.269x^(-1)-0.019
    0.91x-70.17x+1043.1=0
    1.5/(1+x)*18=10
    lnx/x
    lnx/x
    （30-x）×（400＋5x）=9000
    396×sqrt(1+0.04×x×x)=x×x×sqrt(1+0.005×0.005×x×x)
    700/(1000+112*x)=0.607
    700/(1000+112*x)=1.793
    （1000+112*x）/5.6+150/(1/6*2*2.8*2.8)=1.2*(150+55.5*(x-0.5))
    （1000+112*x）/5.6=150+55.5*(x-0.5)
    x*ln（x/9.054)=0.7370101953077
    (6x-7):5x=1:2
    81.9207/x=1.05

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