sinx=1
     sinx=1
    8.586x-0.89sin(2*180*x)=1.25
    4x-e^x=0
    4x-e^x=0
    0.000225x*x-0.0515x+3.76=0.44
    (0/0)x=1
    (1/0)x=1
    x/2=0 2/x=1
    x2=0 2/x=0
    x2=0 2x=0
    0.622*x*（101325-x）=0.0217
    （7%-i）/（7%-6%）=（4.1002-4.20）/（4.1002-4.2124）
    （7%-i）/（7%-6%）=（4.1002-4.20）/（4.1002-4.2124）
    arctanx-π/2-arctan1+arctan(2x/(10-x²))-arctan(x/5)
    X+945/1430X=69000
    0.1x^6+5.8x^4-352x^2+307.2=0
    1/(x+10)=1/(x+1)+1/x+4/(x+4)
    a×0.6=37.8
    a×0.6=20.9

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