x/(6.25-x)/(3.125-x)*10^9=10^7
    x/(6.25-x)/(3.125-x)*10^9=5.653*10^7
    x/(6.25-x)/(12.5-x)*10^9=5.653*10^7
    x/(25-x)/(12.5-x)*10^9=5.653*10^7
    x/(25-x)/(50-x)*10^9=5.653*10^7
    x/(100-x)/(50-x)*10^9=5.653*10^7
    x/(100-x)/(200-x)*10^9=5.653*10^7
    x/(100-x)/(200-x)*10^9=5.653*107
    x/(100-x)/(200-x)*10^9=7641.8
    x/(100-x)/(200-x)*10^9=1.106*10^6
    x/(100-x)/(200-x)*10^9=3.804*10^6
    x/(100-x)/(200-x)*10^9=1.588*10^7
    x/(100-x)/(200-x)*10^9=5.653*10^7
    x/(100-x)/(200-x)*10^9=5.075*10^8
    x/(100-x)/(200-x)*10^7=5.653*10^7
    x/(100-x)/(200-x)*10^7=5.075*10^8
    0.11=0.6*(1+x)/11.28+x
    （x-2）*（x+1）=0
    X+30+ (X+30)/（1−0.003）×0.003=400
    3+x=2(x+0.5)

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