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
    sinx-x
    X/0.6=8.4
    1.5X=10.5
    -10000000+x/1.0865+x*1.025/(1.0865)^2+x*(1.025^2)/(1.0865^3)+x*(1.025^3)/(1.0865^4)+(x*1.025^4+10800000)/(1.0865^5)=0
    s^2+8s+20=0
    (126+280)/28*x+224/28*(x+15)+84/28(x+30)=950

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