A²+A＝240
    2x*9+x-36=250
    x*x-670x+23300=0
    (x-120)*(-2/25x+44)=2400
    x*x-670x+23300=0
    lnx=-x
    x/2.7+748/7.9-x/7.9=200
    7+3x+6=5+4x
    (X-160000)*(1-0.25)/250000=(X-360000)*(1-0.25)/200000
    (X-160000)*(1-25%)/250000=(X-360000)*(1-25%)/200000
    （EBIT－320）（1—25%）/（4800＋400）＝（EBIT－560）（1—25%）/4800，
    -x=12
    arcsinx=x
    tanx=x
    tanx=x
    cosx=x
    sinx=x
    cosx=sinx
    cosx=x
    sinx=x

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