（36-6t/5）²+t²＝4t²
    xsin(25136.94/x)=435
    x*sin(25136.94/x)=435
    xsin(877*90/π*x)=435
    24*0.787+25*(0.213-x)+26*x=24.305
    470x/(470+x) = 380
    xsin(877/2*x)=435
    x=14
    x=27
    1+COSx
    2^x=x^2
    -1/2x^2+3/2x=0
    a^2+3a=4
    3（2-x/2-x/6）+2x
    0.168=0.137Z^-3+0.119Z^-2+0.269Z^-1-0.019
    0.129=0.137Z^-3+0.119Z^-2+0.269Z^-1-0.019
    0.434=0.137Z^-3+0.119Z^-2+0.269Z^-1-0.019
    （x-200-300）×0.75-55/100=(x-200)×0.75-55/200
    （x-500）/100=(x-200)/200
    x^3-4×x^2+（5/2）×x-6=0

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