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x in (-oo:+oo)
p = (-1/2)*s^2+280*s-1200 // - (-1/2)*s^2+280*s-1200
p-((-1/2)*s^2)-(280*s)+1200 = 0
p+(1/2)*s^2-280*s+1200 = 0
p+1/2*s^2-280*s+1200 = 0
x naleu017Cy do R
x in (-oo:+oo)
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