x*sqrt(1+x*x)*sqrt(1+x*x/4)=2
    -pi/2-arctan(2.21243)-arctan(1.106215)
    8/(x*(sqrt(1+x*x))*(sqrt(1+x*x/4)))=1
    3X+4.2x=36
    x=1.33%x+29500
    （1-x）*100/（1+x）=56.204-56.204*x
    (155.6+50)x0.8
    x=1.33%x+22500
    x=6.72%x+22500
    x-703=3.793*x^(2/3)
    x-1544=2.4653*x^(2/3)
    91823+1283x-933+1*3=9293x
    4x^-2x^3-16x^2+5x+9=0
    4x^-2x^3-16x^2+15x+9=0
    4/(x*sqrt(1+x^2/4))=1
    arctan0.1x+arctan0.2x-arctan0.5x-arctanx-arctan(6.55×0.001x÷(1-0.0000655x^2))=-90
    8244.08+9.415a=2743.23+212.06a+9.72×(a+13)×(316.8+20.8a)÷(16+a)
    -x3+3x2+12x-96=0
    ln（1.718x+1）＝x
    ln（（e-1）x+1）＝x

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