10/(x*sqrt(1+x^2))=sqrt(2)/2
    atan(0.2x)=90
    2x^2+5x-3=0
    s^3+2s^2+0.75s=(s+1)(3s^2+4s+0.75)
    0.04x^2+x=10000
    3x^2+4x+0.75=0
    0.04x^3+x^2=10000
    3x^2+2x+0.75=0
    20lgx=1.7
    x/(1.4*sqrt(1+0.25*1.96)*sqrt(1+0.01*1.96))=1
    arctan0.5x+arctan0.1x=45
    13.03×c=（3.1+c）×7.92
    （5.58-5.58/1.13*0.13+0.13）/7.03=X
    （6.62-6.62/1.13*0.13+0.15）/7.03=X
    －136363x*x＋174921x－56095＝0.5
    －116912x*x＋149143x－47895＝0.5
    －0.0206x*x＋0.2675x＋0.0331＝0.5
    40000000=14.3*1000*x*(220-x/2)
    （25.851+x）×2.55＝51.702+70.353-x
    （25.851+x）×2.35＝51.702+70.353-x

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