(x+1)^(1/2)=x-4
    r^4-r^3-r^2+2r+4＝0
    x*x8855-11033330x+849658000
    12.5%x+10＝18
    arctanx-arctan0.25x＝46
    arctanx-arctan0.25x＝46
    13115.72/3.64=150*0.45*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*1.185x*x/0.002
    11872/2.72=150*0.45*0.45*0.00001904*X/0.55/0.55/0.55/0.002/0.002+1.75*0.45*1.185*X*X/0.55/0.55/0.55/0.002
    13115.72=150*0.45*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
    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
    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
    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
    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

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