13115.72 = 150*（1-0.55）*0.45/0.55/0.55/0.55*0.0000184*X/0.002/0.002+1.75*0.45/0.55/0.55/0.55*1.185*X*X/0.002
    13115.72 = 150*（1-0.55）*0.45/0.55/0.55/0.55*0.0000184*X/0.002/0.002+1.75*0.45/0.55/0.55/0.55*1.185*X*X/0.002
    arccot1.394
    13115.72=150*（1-0.55）*0.45/0.55/0.55/0.55*0.0000184*X*0.002+1.75*0.45/0.55/0.55/0.55*1.185*X*X/0.002
    arccotx=1.394
    15=100×（X-60）/（X×30/100）
    0.181×sinx/cos(x-5)+0.01+0.01×sinx=0.181
    eiπ
    x^(1.5)-2*x^(0.5)=1
    x+1/6-2/3=8/5
    arctanx=38.8
    14299.12=3.18*（839.81968*x+2766.6040571*x*x）
    x=0.92*0.99+2.14*0.14
    x=0.92*0.14-2.14*0.99
    x=400*0.93*0.01*2.87*0.2
    x=400*0.4*0.01*2.87*0.2
    x=0.2*(1-0.6*(1-0.26))-0.25*0.2*0.2*0.87
    x=0.010104/2*(2*0.010104/(8*3.14)+(400+(342.6/2)/(6*8000))
    x=0.010104/2*(2*0.010104/(8*3.14)+(400+(342.6/2)/(6*8000))
    x=1/2*(3/4*0.0025*((1-0.33*0.33)/220000+(1-0.077*0.077)/105200)*326)^(1/3)

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