0.7=1000*sqrt(x^2/800+2.8x)-2.65x
    2.65*x=1.25*sqrt(x^2/800+2.8x)
    2.65*x=1.25*sqrt(x^2+2240x)
    1400=2.5*sqrt(x^2+3200x)-3.8x
    x^6+1
    1400=2.5*sqrt(x^2+3200x)-1.4x-x/1600000
    10-2（10-2X）=8
    x/(x+1)=1%
    x/(x+1)=2%
    x/(x+1)=3.5%
    x/(x+1)=5%
    x/(x+1)=7.5%
    x/(x+1)=7.5
    X*2-2352x=116630
    X2-2352x=116630
    (x-117.602)*10-0.6-0.6=2
    In(-0.05)
    0.134/x＝0.1289/0.86289
    0.4/100.58＝x/33.7
    4x+2*（22-x）=70

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