6*0.25*3.14*x^2=190*10^3/(0.9*(4-0.08x)*sqrt(19.1/360))+47.5*10^6/(1.3*0.9*300*360)
    14.3*250*x=360*4*314+(((0.8*0.0033*700/x)-0.0033-0.000913795)/0.01)*2000*90
    x^3+3x-2
    x*(sqrt(1+x*x))*(sqrt(1+x*x/4))=2
    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

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