X*3500* 7.1099＝90×3500 + 0.14308 * 175 *60+200+200+（405+16+20）* 7.1099 + X*3500* 7.1099*（1+10%）*（0.8%+0.08%）+（X*3500* 7.1099×0.13%+ 200 + 100）+（X*3500* 7.1099×5% + 200 + 200 + 28×7.1099）+X*3500* 7.1099* 30% -（ 90×3500×13%/(1+13)+0）
    1.8×10^－11＝X×(X+1.25×10^－3)
    25+x^2+（2-x）^2+1=40
    0.9*0.79*2.29*x=4.2
    0.91*x*2.76*1.99=2.65
    x+23=0
    s^3-6s^2+15s-10 = 0
    s^3-6s^2+15s-10 = 0
    4.5x减0.6x等于0.78
    xx=2
    x*x*x*x=16
    x*x=16
    （n－1）(n－4)＝3
    （320+0.78X）/2=0.95 320+0.78X=1.9*(320+X) 320+0.78X+320*1.9+1.9X 320+0.78X=608+1.9X
    -0.1025x^4+2.0286x^2+1.1025＝0
    x^2+4x+5=0
    xtanx＝2
    x+3x/1.56+4x/1.96+7x/2.44+14x/3.36+56x/3.74+7x/4.16+7x/6.93=59400
    x+3x/1.56=59400
    (8450+50+X)*3.25%=4X

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