38.44+116.76+275.02=33.22+61.79+181.83+x(74.34+13.07x)
    7500/(112×0.12+x)+10000/(112×0.2+x)+10000/(x)=150
    7500/(112×0.12+x)+10000/(x)+10000/(x)=150
    7500/(112×1.12+x)+10000/(112+x)+10000/(112+x)=150
     2942.828*3.1415926*0.00636*（45-x）^0.75 = 49.7*0.3*（x-37.5）
     2942.828*3.1415926*0.00636*（45-x）^0.75 = 43.96*0.3*（x-37.5）
    2942.828*3.1415926*0.00636*（45-x）^0.75 = 47.96*0.3*（x-37.5）
    2942.828*3.1415926*0.00636*（45-x）^0.75 = 47.96*0.3*（x-37.5）
    2942.828*3.1415926*0.00636*（45-x）^0.75=69.25*0.3*（x-37.5）
    2942.828*3.1415926*0.00636*（45-x）^0.75=69.25*0.3*（x-37.5）
    √2-x²
    x^12=1.12
    e^x/x=x/lnx
    e^x/lnx=x/lnx
    x^2+6=10
     0=（1200-100x）（20+2x）
    0.001068x-9.3364
    lgx=2.4666
    38.44+116.76+40.91=33.22+61.79+x(98.23×2+26.13x)/2
    X-(X*0.3)=298464

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