e^(-(5.6-15.2)*4190/8.314/310)=10^9*6.25/(x-6.25)/(2x-6.25)
    0=x*12-165*12-250*12-1500
    （6.93-6.93/1.13*0.13+0.15）/6.81=X
    （5.75-5.75/1.13*0.13+0.13）/6.81=X
    0=1200*x-180*x-800*x-2200
    (12838.52+x)*4.92%=4x
    x/(1-x)/(2-x)=1
    x=2
    x/(10^(-7)-x)/(2*10^(-7)-x)=10^7
    x/(1-x)/(2-x)=10^7
    2x+56-4x
    25 - x = 10
    7.92（c+3.3）=13.16c
    7.92（c+3.3）=13.16
    d^-1+（d+1）^-1+（2+d）^-1=0
    s^3+7s^2+10s+24=0
    s^2+0.9s+1=0
    d^-1+（d-3）^-1=（d+1）^-1
    x(x+1)=156
    (116.5+202)/28*x+180/28*(x+15)+112/28(x+30)=2358

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