срочно,помогите .даю 50 баллов (6а-6)(6а+6)-6а(6а+6) при а=3. Created by anechkaanyutca. matematika-ru

срочно,помогите .даю 50 баллов (6а-6)(6а+6)-6а(6а+6) при а=3...

knyaginyaolga (6*3-6)*(6*3+6)-6*3*(6*3+6)= 12*24-6*3*24=288-432=-144

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Sakharovaanny04 Сначала упростим:
(6а+6)-6а(6а+6) = (6а+6)(6а-6-6а) = 6(а+1)(6а-6-6а)=6(а+1)(-6) = -6•6(а+1) = -36(а+1)

Подставляем а = 3:
-36(3+1) = -36•4 = -144

Ответ: -144

3 votes Thanks 4

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