X=20827-(2570+17.8%X)
    X=20827-(2856+17.8%X)
    X=20827-(662+17.8%X)
    X=18624-(662+17.8%X)
    X=13019-(662+17.8%X)
    0.5%X+552+110+17.3%X=662+17.8%X
    1+(1+x)+x(1+x)=49
    9.8x=9.8*4+50.7+0.031*（20+x）÷0.053*0.355*0.355÷2+0.035*15÷0.022*0.816*0.816÷2
    9.8x+101.3=9.8*8+91.2+0.031*（20+x）÷0.053*0.355*0.355÷2+0.034*20÷0.022*1.237*1.237÷2
    9.8x+101.3=9.8*8+91.2+0.031*（20+x）÷0.053*0.355÷0.355÷2+0.034*20÷0.022*1.237*1.237÷2
    9.8x=9.8*-10.1+0.031*（20+x）÷0.053*0.355÷0.355÷2+0.034*20÷0.022*1.237*1.237÷2
    9.8x=9.8*4+50.7+0.031*（20+x）÷0.053*0.355÷0.355÷2+0.035*15÷0.022*0.816*0.816÷2
    9.8x=100
    36+（16-5x）^2=100
    lg(x)=-2.88
    -0.0029x2 + 0.8093x + 19.767=30
    42x^3 +31x^2 -42x+9=0
    5/7：x=4/9:2
    （1000+x）*0.97=x
    x=(x-3256.62)*50

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