Question

3. Өрнектерді ықшамдаңыз: \( -\mathrm{a}-(\mathrm{a}+2 \mathrm{~b}-(-\mathrm{b})) \) A) \( 3 b \) B) \( -a+2 b \) C) \( -2 a-3 b \) D) \( -2 a+3 b \) E) \( -3 b \)

Ask by Pope Morrison. in Kazakhstan
Feb 09,2025

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Tutor-Verified Answer

Answer

Правильный ответ: C) \( -2a - 3b \)

Solution

Дано выражение:   ‑a   – (a + 2b – (–b)) Сначала упростим выражение в скобках. Заметим, что –(–b) = +b, тогда:   a + 2b – (–b) = a + 2b + b = a + 3b Подставим обратно:   ‑a – (a + 3b) Раскроем скобки со знаком минус:   ‑a – a – 3b = –2a – 3b Таким образом, правильный ответ – вариант C: –2a – 3b.

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Алдымен өрнектегі жақшадағы мәнді анықтайық: \(-(\mathrm{a}+2\mathrm{b}-(-\mathrm{b}))\) дегеніміз \(-\mathrm{a}-2\mathrm{b}+ \mathrm{b}\) болады. Оны әрі қарай ықшамдайық: \(-\mathrm{a}-(\mathrm{a}+2\mathrm{b}+\mathrm{b}) = -\mathrm{a}-(\mathrm{a}+3\mathrm{b})\). Осыдан кейін: \(-\mathrm{a}-\mathrm{a}-3\mathrm{b} = -2\mathrm{a}-3\mathrm{b}\). Сонда ықшамдалған өрнек: \( -2 a - 3 b \) (C). Сондықтан, дұрыс жауап - C) \(-2 a-3 b\).

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