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x in (-oo:+oo)
f = 3.14*(1/8)*p*r^2 // - 3.14*(1/8)*p*r^2
f-(3.14*(1/8)*p*r^2) = 0
f-0.3925*p*r^2 = 0
f-0.3925*p*r^2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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