Предмет: Алгебра, автор: vcxzzxcv646

12. Найдите значение выражения: a+2b/b если a/b=2

13.найдите tg a,если sin a=5/13,π/2<a<π
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Приложения:

Ответы

Автор ответа: phoenixbeyblade2008
0

Ответ:

12) 4;  (тут уверен)

13) Сори бро не знаю сколько, там нужно cos знать, и можно будет найти tg, мне кажеться тут где-то есть ответ какой будет косинус (90 < A < 180).

Объяснение:

12) b = x, a = 2x

2x/x = 2

2x + 2x/ x = 4x/x, x сокращаеться, будет 4

13) Пи равно 180 градусов.

180/2=90 градусов

90 < A < 180

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