11.9*400*x+1610*300-（298320/x-660）*1610+0.9*215*2300.6-（318962/x-680）*2300.6 = 2500000
    11.9*400*x+1610*300-（298320/x-660）*1610+0.9*215*2300.6-（318962/x-680）*2300.6 = 2500000
    11.9*400*x+1610*300-（298320/x-660）*1610+0.9*215*2300.6-（318962/x-680）*2300.6 = 2500000
    11.9*400*x+1608*300-（298320/x-660）*1608+0.9*215*2300.6-（318962/x-680）*2300.6 = 2500000
    11.9*400*x+（2*491+2*314）*300-（298320/x-660）*（2*491+2*314）+0.9*215*2300.6-（318962/x-680）*2300.6 = 2500000
    0.5*（299.56x+13.86x^2)*(449.34x+13.86x^2)/(898.68+41.58x)+35.15x-0.5*(299.56x+31.71x^2)*(449.34x+31.71x^2)/(898.68+95.13x)
    7600/(x+101*0.12)+10000/(106*1.1)+2600/(106*1.22)=150
    11.9*400*x+（2*491+2*314）*300-（298320/x-660）*（2*491+2*314）+0.9*215*2300.6-（317127/x-680）*2300.6=2500000
    2*x+3=6
    7600/(x+101*0.12)+10000/(104*1.1)+2600/(104*1.22)=150
    7600/(x+101*0.12)+10000/(102*1.1)+2600/(102*1.22)=150
    0.5x²-465x+44755.24＝0
    0.5x²-465x+55.94＝0
    0.5x²-465x+44.76＝0
    0.5x²-465x+2.56＝0
    －1/3x²+4＝1.57
    （16-a）(100+10a)=1200
    2x^2+6x+3=0
    a^2+a(√a^2+9)=9
    x^2+2x-1=0

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