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
    （25.851+x）×2.15＝51.702+70.353-x
    （25.851+x）×1.95＝51.702+70.353-x
    （25.851+x）×1.75＝51.702+70.353-x
    （25.851+x）×1.55＝51.702+70.353-x
    60/a+2+1/2*a*(6/a+2)^2+7=16*6/(a+2)-(6/a+2)^2
    (58-y-35)(400+20y)=8400
    1+x/1
    2.93*(1-x^10)/(1-x)=331.62

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