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)
    x+log(10,x)
    39=arctan0.2w+arctan0.5w
    39=arctan0.2w+arctan0.5w
    50x-100+160=55x-55
    50x-100+160=55x-55
    70（1+ x）∧400=2000000
    59.08=X-2/x

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