（1-1/（1+r）^5）/r=0.37908
    lg（（r+r^6）/（1+r））=5/0.37908
    -7x^2+7x+14=0
    sinx+4.373-2.674x=0
    sinx+4.373-2.674x=0
    x/30*21=991
    -10lg(1-x)=0.053
    (X*0.016)/2+X=100000
    26.53*exp(-0.001262*(1+0.8905*x)*x)+((59.72*0.1208*(1+0.02379*x)*0.7114)/(0.001262*(1+0.8905*x)-0.1208*(1+0.02379*x)))*(exp(-0.1208*(1+0.02379*x)*x)-exp(-0.001262*(1+0.8905*x)*x))
    150+1/5x+1/4（150+1/5x）=x
    2x^3＋x^2＋x＝2
    500+10x=(500+10x)/7.5
    500+10x=10x/7.5
    900÷20+x=700÷x
    tan(x)-x^2=0
    tan(x)-x^2=0
    2.57=3-x/2342.1
    2.63=3-x/2230.7
    2.75=3-x/2054.1
    （60.4+46.1+x）/3*50%+55.8*50%=50

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