0.1*(8.33^2/H^2)-H+0.51=0
    （5000×12×0.9-70%×115X×6.4%）÷（30%×115X+5%×115X）=2.7%
    4x=1
    x*x*3.14 =19.625
    196x^(2)－208√3x＋165＝0
    x*x=6.25
    Y/45+Y=180
    (12.25*17.89+24.99*14.11+27.87*7.4+14.62*(-0.48)+5.98*(-12.54)+14.29*x)/100=18.86
    X=45 Y/X+Y=180
    0.012s^2+0.1s+1=0
    (12.25*17.89+24.99*14.11+27.87*7.4+14.62*(-0.48)+5.98*x)/85.71=8.12
    (12.25*17.89+24.99*14.11+27.87*7.4+14.62*(-0.48)+5.98*x/85.71=8.12
    25x+15(45-x)＝975
    1118
    1/X + 1/X+2 + 1/X+4
    0.64+0.36*(x*(0.95*70+5)+0.5)/0.5=2.93
    0.64+0.36*(x*(0.95*70+5)+0.5)/0.5=0.64+0.36*5.09/0.8
    lnx*lnx*(x*x+x+1)=3*(x+1)*(x+1)
    3.47/H^2-H+0.754=0
    x^3+x^2-x+1=0

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