x^2+1330x-12800=0
    40m+(80+60)(12-m)/2+40=640
    40m+(80+60)(12-2m)+40=640
    x＾2-30x+105＝0
    x＾2-30x＝0
    x/4.5=64*4.5*4.5/(x*x-64*4.5*4.5)
    e^（x+1/x）=0
    0.101*(1-exp(-1.1*0.09))*44.6*1000*0.0072 = x
    0.101*(1-exp(-1.1*0.08))*44.6*1000*0.0072 = x
    16.8x5
    2=e^（x+1/x）
    5x+12=8x-3
    0.101*(1-exp(-1.1*0.158))*44.6*1000*0.158^2 = x
    0.101*(1-exp(-1.1*0.157))*44.6*1000*0.157^2 = x
    0.101*(1-exp(-1.1*0.158))*44.6*1000*0.158^2 = x
    0.101*(1-exp(-1.1*0.159))*44.6*1000*0.159^2 = x
    0.101*(1-exp(-1.1*0.16))*44.6*1000*0.16^2 = x
    0.101*(1-exp(-1.1*0.161))*44.6*1000*0.161^2 = x
    0.101*(1-exp(-1.1*0.159))*44.6*1000*0.15.9^2 = x
    0.101*(1-exp(-1.1*0.15.9))*44.6*1000*0.15.9^2 = x

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