x^2-37x+242=0
    70+5x=175-12.5*x/1.193
    20x^2-341x+1449=0
    520+600/x=-0.04*(70+105/(1+2.5/x))^2+14*(70+105/(1+2.5/x))
    d（2d+3）+(d+1)(d+2)=0
    （10000-2400-2500-4000）/x+10000/（x+22.4）+10000/x+10000/x=150
    520+600/x=-0.04*(70+105/(1+2.5/x))^2+14*(70+105/(1+2.5/x))
    25.35+3.45x-19.72+1.19x=0
    2.155X+(1000/135)*(940-X)=2860
    2.155X+(1000/126)*(850-X)=2380
    V=1125.89+80.00+36.18+0.01V+51.48+0.0002V+77.61+0.0006V+0.0529V
    K=1574+31.48+0.01K+35.92+0.0002K+82.07+0.0005K+0.0529K
    3150-3150*sqrt(1-x^2)+1287.1*x = 925
    0.507*（50+6.8x）-0.493*(40+8.5x)=0
    1.925X+(1000/135)*(940-X)=2860
    1.925X+(1000/126)*(940-X)=2860
    3088-3088*sqrt(1-x^2)+1228.6*x=895
    K=1416.5+28.33+0.01K1+32.3+0.0002K+73.86+0.0005K+0.0532K
    1390*x+3162.3*x^2/sqrt(1-x^2)-1390*x/sqrt(1-x^2) = 895
    V=1125.89+80.00+36.18+0.01V+51.48+0.0002V+77.61+0.0006V+0.0532V

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