(x+80)(x+50)=5400
    50(1+x)^2=72
    x^2+30000x+30000000=0
    8.5%×W+18%×（1-W）=14.2%
    8.5%×X+18%×（1-X）=14.2%
    （(2584+1352-6140)/6140)*0.5=((1845+X)-3716)/3716
    V=1159.33+0.839877V
    1159.33+0.839877V
    38xx+114x-86=0
    380xx+1140x-860=0
    0.95（400+400×（1+x）+400（1+x）（1+x））=2000
    ex+e-x
    700x=15000000+415x
    700x=1500+415x
    700x=7500+415x
    (0.47-x)/0.45＝(1.53-x)/1.37
    （(2584+100-6140)/6140)*0.5=((1845+X)-3716)/3716
    100=X-500*10%
    7077.448 = (26.89 * (x - 1) + 5) / (x - 1) * 256
    7077.448 = (x * (x - 1) + 5) / (x - 1) * 256

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