A*A+A=36
    1-(1+x)^(-10)-17x(1+x)^(-1)
    100*(1-(1+x)^(-10))/x*(1+x)^(-1)-1700
    X=25233-(2856+17.8%X)
    X=25233-(2713+17.8%X)
    X=25233-(2570+17.8%X)
    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

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