518867.92-X/1.03-X/1.03*0.03*0.06=0
    x²-8.9x+12.2=0
    x²-13.6x+46.2=0
    x×sinx
    (x-50)/x=0.15
    （x-16%）*80=（18%-x）*160
    F282*10%+F282/1.13*0.13+(F282/1.13*0.13)*12%+F282*1.5%=1786.02
    x*1.2=14400
    6400-800x=200x²
    6400-200x=200x²
    x²－8x＋15
    -20lg(x/22)=6
    -20lg(22/x)=6
    0.501187=(sqrt(40)*sqrt(11)*sqrt(1.1))/x
    -20lgx=6
    20lg(7/x)=6
    -90-arctan(x/2)-arctan(x/5)=-180
    (a+2-(5/(a-2)))/((a^2+6a+9)/(2-a))
    64=144a
    64=（12）²a

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