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
    x=720÷20
    20x*20÷20=720÷20
    0.2X÷0.2*0.2=5÷0.2
    0.2X*0.2÷0.2=5÷0.2
     （0.5-0.3）X=5

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