x/(x+700)=0.8
    x/(x+700)=0.7
    x/(x+700)=0.8
    x/(x+700)=0.6
    x/(x+700)=0.4
    x/(x+700)=0.3
    x/(x+700)=0.2
    x/(x+700)=0.5
     x/(x+700)=0.1
    x/x+700=0.1
    X/11+X=44000
    X/10+X=44000
    a*a=8 axb=16 b*b
    （100+1200）*10*0.5+0.1*(100+1200)*10-40*10-40x=(100+1200)x
    （x+1000）/x=1.5
    2000/（2000-x）=2
    2000/（2000-x）=2
    2000/（2000-x）=2
    2000/（2000-x）=2
    2000/（2000-x）=2

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