3x²-8x-9=0
    2x^2 + 5x - 3 = 0
    39=arctan0.04w
    -141=arctan0.04w
    90=arctan12.5w-arctanw+arctan0.1w+arctan0.00166w
    270=arctan0.1w+arctan0.0016w+arctan24.26w-arctan1.38w
    50÷150=x
    270=arctan0.1w+arctan0.0016w+arctan0.04w-arctan0.0023w
    42=arctan0.1w+arctan0.00166w
    （480*63-x）*0.85+504=24420.45-599
    （480*63-x）*0.85+504=24420.45
    4*x-1-cos(x)
    e^x+10*x-2
    2x＝2
    4x^2-24x+27=0
    1/x-x=3/2
    x^2 + 5x - 6 = 0
    lg(x+3.15)=1.216
    k-4+log(10,(k-4)/111)
    x-3+log(10,（x-3)/11)

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