(40-x)*2x=1200
    (15140+200+X)*2.2%=4X
    (15140+200+X)*3.3%=4X
    X=998+30.44+100+56.42+33.18+0.056X+169.27
    X=941+28.70+75+53.49+31.38+0.056X+147.12
    80/100=（X-5000）/2000
    7.05=（（0.021*x^1.85+955）^0.5）*x^0.84
    930=（（0.021*x^1.85+955）^0.5）*x^0.84
    20*lgx=45.11
    20*lgK=45.11
    (x+1)*352+311=2000
    x^2-5.1x+6.2=0
    x^2-5.1x+6.2=0
    x2-5.1x+6.2=0
    x2-5.1x+6.2=0
    x2-5.1x+6.2=0
    x2-5.1x+6.2=0
    x2-5.1x+6.2=0
    10.8%=0.8×（1+g ）/10+g
    3.14/(x*sqrt(1-0.34^2))=1

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