1/d+1/(d+5)=1/(d+2.5)
    2.43x-0.46= -0.0038x^4 + 0.0471x^3 - 0.3005x^2 + 1.2573x
    1/(x)+1/(x+5)=1/(x+2.5)
    0.3*X^2-1.1*X+1=0
    2.43x-0.46= -0.0038x4 + 0.0471x3 - 0.3005x2 + 1.2573x
    68x^2-118x+25=0
    2x+5x=20
    68x2-118x+25=0
    arctan0.2x+arctan0.5x+arctan2x=90
    0.25xx+x=4
    x+5=12
    0.25x^(2)+x=4
    1 - ( 1 - 1 / 30000 ) ^ ( 120 * x ) >= 30 %
    sinx=0.658
    5X+4x=37
    7.502382*x = 1-[1/(1+x)]^10
    1.026*x+(1-x)*7.6687=7.217
    x^2+4x-480=0
    x:(5.4一x)=5:4
    （x-2)(x-5)^2-24x+40=0

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