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Mishidze
@Mishidze
August 2022
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(√21+√2)^2-2√42 Хммм...
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zinaidazina
(√21+√2)
²
- 2√42 =
= √21² + 2·√21·√2 + √2² - 2√42 =
= 21 + 2√42 + 2 - 2√42 =
= 21 + 2 = 23
7 votes
Thanks 7
Mishidze
Точно.. Забыл про (a+b)² = a²+2ab+b².. Спасибо =)
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Answers & Comments
= √21² + 2·√21·√2 + √2² - 2√42 =
= 21 + 2√42 + 2 - 2√42 =
= 21 + 2 = 23