4*6.37*10^5*4200*（1+x^2）+5.5*10^9*32-235*3.14*4200^3*（1-x^4）
    x=(x*7+42189)/20-709
    (6-x)*((1/4)*x+2)∧2+6＝0
    4*6.37*10^5*4200*（1+x^4）+8.4*10^8*32-235*3.14*4200^3*（1-x^4）
    16200/x+10000/（x+22.4）＝150
    4*6.37*10^5*4200*（1+x^2）+8.4*10^8*32-235*3.14*4200^3*（1-x^4）=0
    0.3637*x*x-x+1-1/ex=0
    pi
    52-X=38
    21*(1-r^11)/(1-r)-21=169.077
    （x-4300）/4300=0.5
    11.9*(1-r^11)/(1-r)-11.9=404.646
    5.82*x^2-43.2*x+91.72=37
    52-X-4=34
    5.82*x^2-43.2*x+91.72=32
    5.82*x^2-43.2*x+91.72=27
    5.82*x^2-43.2*x+91.72=22
    5.82*x^2-43.2*x+91.72=17
    a+1/a=1
    597*(1-r^11)/(1-r)-597=6617.25

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