arctan（w/5）+arctan（w/15）＝90
    80(1-x)(1-x)=51.2
    arctan（w/5）+arctan（w/15）＝90
    80-(80-80x)x=51.2
    arctanw/5+arctanw/15＝90
    x*x+35.72-162.4＝0
    x*x+35.72x-1786＝0
    x*x+35.72x-1786＝0
    sinx/1
    3(x-2)+1=x-5(2x-1)
    63-x÷10=x
    4X-17=2X-2
    4X^3+0.04X^2=5.61×10^12
    (6x+2x) (2x+6)
    0.000096117=(e^(-14370/x)+6.35)/(e^(-5880/x)-1.3)
    0.000096117=(e^(-14370/x)+6.35)/(e^(-5880/x)-1.3)
    sinx=0.004
    0.000096117=(e^(-14370/x)+6.35)/(e^(-5880/x)-1.3)
    0.000096117=(e^(-14370/x)+6.35)/(e^(-5880/x)-1.3)
    0.000096117=(e^(-14370/x)+6.35)/(e^(-5880/x)-1.3)

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