（26.813+x）×2.95＝53.627+72.74-x
    （26.813+x）×2.95＝53.627+72.24-x
    0.95*n*(n-1)*(n-2)*(n-3)*(n-4)= (n-5)*(n-6)*(n-7)*(n-8)*(n-9)
    0.95= (n-5)(n-6)(n-7)(n-8)(n-9)/ (n(n-1)(n-2)(n-3)(n-4))
    X+X*0.06=2632795.18
    X+X*0.06=4057478.16
    x-590=590*0.01
    x-590=590*0.001
    2x+x=95
    2x+x=5
    2X:x=5
    x-470=0.01x
    (8+12x)(x-0.5)=23.8x
    (8+12x)(x-0.5)=8.28x
    (8+12x)(x-0.5)=8.28
    2480000=(8.314*290)/(x-0.000045)-9.86/290^0.5(x^2+0.000045x)
    260×10^6=2002000x-1785.5x^2
    260×10^6=14.3×250x（560-x/2）
    20*w^4-47.5*10^3*w^2+2.5*10^6=0
    20*w^4-47.5*10^3*w^2+2.5*10^3=0

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