помогите пожалуйста со 2 заданием а) и б). Created by beccaa. algebra-ru

Ответ:Объяснение:

помогите пожалуйста со 2 заданием а) и б)...

beccaa @beccaa

August 2021 1 7 Report

помогите пожалуйста со 2 заданием а) и б)

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MatemaT123

Ответ:

$100 \quad ; \quad 17 \quad ;$

Объяснение:

$a^{2}-2ab+b^{2}=(a-b)^{2}; \quad a^{2}-b^{2}=(a-b)(a+b);$

$17^{2}-34 \cdot 7+7^{2}=17^{2} -2 \cdot 17 \cdot 7+7^{2}=(17-7)^{2}=10^{2}=100;$

$\dfrac{67^{2}-33^{2}}{15^{2}-25}=\dfrac{(67-33) \cdot (67+33)}{(15-5) \cdot (15+5)}=\dfrac{34 \cdot 100}{10 \cdot 20}=\dfrac{34 \cdot 10}{20}=\dfrac{34}{2}=17;$

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MatemaT123 Пожалуйста.

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