(a²+2)(a-1) -a(a²+2) = (a²+2)(a-1-a) = -(a²+2)
Не может, т.к. a² >= 0 ⇒ a²+2 > 0, -(a²+2) < 0
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(a²+2)(a-1) -a(a²+2) = (a²+2)(a-1-a) = -(a²+2)
Не может, т.к. a² >= 0 ⇒ a²+2 > 0, -(a²+2) < 0