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
    64=12a
    2.5=x*sqrt(1-2*0.2^2)
    2.5=x*sqrt(1-2*2^2)
    90-arctan(10x)-arctan(0.1x)=30
    （5X+109）/5=x+5
    5X+109/5=x+5
    x^2-36x+37.125=0

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