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    2x^2-9x+1=0
    20000/6104.56=(1-(1+i)^(-4))/i
    0.25a^4-1.5a^3+2.25a^2-a=0
    1/4a^4=1
    6059=x+x*0.05
    25x^2-121=0
    —2x^(2)—8x—4
    (x^2+0.046095)/(2*x*0.272)=0.447
    (1-e^(-0.1*x))*300*e^(-0.1)=100
    300*e^(-0.1)*(1-e^(-0.1*x))
    (x^2+0.272^2-0.167^2)/(2*x*0.272)=cos63.45
    (x^2+0.272^2-0.167^2)/(2*0.167*0.272)=cos63.45
    32×32+xx-64x+40×40-xx=320
    6059-(X*5%)=X
    64X=40×40+32×32-320
    x+2x=456
    17-2x=7
    16+2m/7=18
    (6+n)50%=9
    11-2x=5

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