0.675x^2=2.7
    0.8x^3-2.84x^2+24x-39.75=0
    arctan（0.1*w）+arctan（0.5*w）+arctan（w）=4*arctan1
    arctan0.1w+arctan0.5w+arctanw=4*arctan1
    arctan0.1w+arctan0.5w+arctanw=3.14
    2x^3-16x^2+20x=0
    3x^2+300x+5000=0
    X^2-144x+5760=1000
    （x-30）（-2x+240）＝3600
    -3sin(3t)-2cost=0
    cos(3x)-2sinx-0.5=0
    cos3x-2sinx-0.5=0
    x=5*(sin50)/(sin112)
    x=sin30
    105.16x^2 + 2095.4x + 0.3558=881.6
    105.16x^2 + 2095.4x + 0.3558=2204
    105158x^2 + 2000000x -110.57=2204000
    105158x^2 + 2000000x + 355.77=2204000
    105158x^2 + 2E+06x + 355.77=2204000
    x^2-48x+432=0

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