n(n+2)=3. 324
    3141=103000*x*(1+x)^36/((1+x)^36-1)
    3050=100000*x*(1+x)^36/((1+x)^36-1)
    2030=70000*x*((1+x)^36)/[((1+x)^36)-1]
    3141=103000*x*((1+x)^36)/[((1+x)^36)-1]
    2030=70000*x*(1+x)^36/((1+x)^36-1)
    2030=70000*x*(1+x)^36/((1+x)^36)
    x^2+ln(-x)=0
    x^3-10x^2-17x+20=0
    x*3-10x*2-17x+20=0
    0.997X+0.003x=969.08
    x-500/x/0.13=2.5
    x/0.13×2.5=x-500
    (3.3-0.7＋0.6×sqrt(2.4×x))/(1＋sqrt(2.4×x))＝1.4
    0.007309926x^2+0.646709778x -0.241589556
    (4×x^2)/(2-x^2)=55.3
    150×(3.3-1.23×x-1.37-0.7)^2=240×(2×(1.23×x＋1.37-0.6)×x-x^2)
     x^2+0.052x-0.10044=0
    150×(2×(3.3-0.77×x＋1.17-0.7)×(3.3-x)-(3.3-x)^2)＝240×(0.77×x-1.17-0.6)^2
    x/(1-x)

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