3x-x=2
    0.64x=16
    350cosx=340
    x-0.36x=16
    147.5cos20=148cosx
    （4/5）/2*3=x
    x*√(0.04*x^2+1)*√(0.01*x^2+1)=30
    xxx-6xx+9x-4=0
    0.4÷18*13=X
    2xx+4x-1=0
    x=cosx
    arctanx+arctan0.05x=90
    arctan（0.2x）+arctan（0.02x）=90
    arctan0.2x+arctan0.02x=90
    arctan0.2x+arctan0.02x=90
    ((4-x)√8x*√(2-x))/(8-3x)
    509.4*(tan arccos 0.76-tan arccos 0.92)kvar
    arctanx=45
    x^2-3x+1.382=0
    x^2-3x+1=0

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