atanx+atan0.1x+atan10x=180
    1+102.01x^2+100.01x^4+x^6=250000
    x^2+8x+20=0
    atanx+atan10x+atan0.1x=180
    atanx+atan10x=60
    atanx+atan(0.1x)=180
    atanx+atan(0.1x)=180
    arctan(0.1x)+arctanx+arctan(10x)=180
    -1.096927829603988=（1/x）*ln（1-x）
    -1.089784066725562=（1/x）*ln（1-x）
    1.019=ln(0.5/x)+2.47*ln(1-x)/0.5
    0.245 = -0.0007x^2+0.0294x+0.0061
    0.269 = -0.0007x^2+0.0294x+0.0061
    0.274 = -0.0007x^2+0.0294x+0.0061
    x^2+2x+0.5=0
    0.306 = -0.0007x^2+0.0294x+0.0061
    V=373.44+0.863900V
    0.308 = -0.0007x^2 + 0.0294x + 0.0061
    0.274 = -0.0007x2 + 0.0294x + 0.0061
    0.306 = -0.0007x2 + 0.0294x + 0.0061

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