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AcorN12
@AcorN12
June 2022
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Помогите срочно с 23номером!!Отблагодарю!Ход решения обязателен!
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m11m
23.
9a² - (a+7)²
=
(3a)² - (a+7)²
=
(3a-(a+7))(3a+a+7)
=
(3a-a-7)(3a+a+7)
=
4a² + 7a a(4a+7) a(4a+7) a(4a+7)
=
(2a-7)(4a+7)
=
2a-7
a(4a+7) a
Ответ: Е)
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Answers & Comments
9a² - (a+7)² = (3a)² - (a+7)² = (3a-(a+7))(3a+a+7) = (3a-a-7)(3a+a+7) =
4a² + 7a a(4a+7) a(4a+7) a(4a+7)
= (2a-7)(4a+7) = 2a-7
a(4a+7) a
Ответ: Е)