x*x+x-1
    （12-54.147715x）（1+x/12）^60 = 12
    （X-（8951.88-75））*7.2*1000=1000000
    （12-101.35392525x）（1+x/12）^142 = 12
    （X*1.05-（8951.88-75））*7.2*1000=1000000
    （12-139.277983x）（1+x/12）^240 = 12
    （12-139.277983x）（1+x/12）^240=12
    （12-139.277983i）（1+i/12）^240=12
    （1-139.277983i）（1+i）^240=1
    10000X*0.95=2850000*10000X*0.25
    49x²＋36x－36＝0
    （x+98）（42-x）（x+98）=25×640×25
    （x+98）（42-x）=25×640
    5×（x-10）²=180
    2x^2+13x+4=0
    2x＾3+21x^2+38x-8=0
    V=267.8+80+10.43+0.01V+13.60+0.0002V+22.31+0.0006V+0.0534V
    V=267.8+80+10.43+0.01V+13.60+0.0002V+22.31+0.0006V+0.0534V
     1=0.61*x*sqrt(2*9.81*4-2*9.81*0.65*x)
     1=0.62*x*sqrt(2*9.81*4-2*9.81*0.65*x)

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