X=3.14/4 X(25X25X0.6)
    X=3.14/4X(25X25X0.6)
    X=3.14/4X25X25X0.6
    x^2-4x-8=0
    x^2+8x+16=7
    [(5/2)/x]=[12x/17-(5*sqrt9)/2]/(12x/17)
    (x-3)^2-16
    (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

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