x=1.9×0.801×143.48/200000×(1.9×65+0.08×36/0.0305)
    x=1.1-0.65×2.01/(0.0305×143.48)
    10.43x^3+49.62x^2-148.84x-1208.49=0
    x=(1113.05×10^6)/(0.87×730×12214.8)
    218cosx-200sinx=81
    -4082750+3000000-450000+X(1-10%)/4>300000
    -4082750+3000000-450000+X(1-10%)/4>=300000
    -4082750+3000000-450000+X-X*10%/4>=300000
    10.43x^3+61.51x^2-40.84x-730.07=0
    x+3/4x^(1/4)=5/4
    -4082750+3000000-450000+A-A*10%/4>=300000
    10.43x^3+89.04x^2+83.95x-495.18=0
    0.5*28.75*(x-1)^2*(1+0.02*x)=153.91955
    （2505/tan(180-x)+510）*(180-x)=3850/2
    10.98x^3+89.04x^2+83.95x-495.18=0
    （2505/tanx+510）*x=3850/2
    1.01^x = x^3
    （2505/tan（x）+510）*x=3850/2
    0.35=2-0.94^-x
    1.01^x=x^3

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