e^(-3.14*x/(sqrt(1-x^2)))=0.4
    x^2-7.8x+6.8=0
    x+0.316019x=3999
    X=1607+49.01+100+87.8+52.48+0.056X+263.4
    39/(39-x)/0.9=2.1
    39/(39-x)/0.9=1.7
    139/(139-x)/0.9=1.5
    139/(139-x)/0.9=1.3
    139/(139-x)=1.3
    29/(29-x)=1.7
    4x-(4x+20)=0
    (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

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