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2003eliza
@2003eliza
September 2021
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Помогите с 4 вариантам ) номер 1 в )
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MizoriesKun
8=2³
а³ +8b³ а³ - 8b³
---------------------- - ----------------------- =
a²-2ab+4b² a²+ 2ab+ 4b²
(a+2b)
(a²-2ab+4b²)
(a-2b)
(a²+ 2ab+4b²)
= ---------------------------- - ----------------------------- = (a+2b)-(a-2b) =
a²-2ab+4b²
a²+ 2ab+ 4b²
= a+2b-a+2b
=4b ,
b=0,05 ⇒4b=4*0.05=0,2
0 votes
Thanks 1
2003eliza
а же равна - 14 15 /16
MizoriesKun
а не нужна , она сократилась ))
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Answers & Comments
а³ +8b³ а³ - 8b³
---------------------- - ----------------------- =
a²-2ab+4b² a²+ 2ab+ 4b²
(a+2b)(a²-2ab+4b²) (a-2b)(a²+ 2ab+4b²)
= ---------------------------- - ----------------------------- = (a+2b)-(a-2b) =
a²-2ab+4b² a²+ 2ab+ 4b²
= a+2b-a+2b =4b , b=0,05 ⇒4b=4*0.05=0,2