Предмет: Алгебра, автор: prlhodaludmila

Розкласти на множники 9-4а в квадрате

Ответы

Автор ответа: Vscoha

0

Объяснение:

9²-2*4а*9+(4а)²=81-72а+16а²

16а²-72а+81=0

D=(-72)²-4*16*81=0

a=72/2*16=2

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