Предмет: Геометрия, автор: psamovol

За рисунком знайти х(ДАЮ 30 БАЛОВ):

Приложения:

Ответы

Автор ответа: dobra888

Відповідь: х = √17 .

Пояснення:

Використаємо Т. косинусів :

х² = 3² + ( √2 )² - 2 ∙ 3 ∙ √2 ∙ cos135° = 9 + 2 + 6√2 ∙ cos45° =

= 11 + 6√2 ∙ √2/2 = 11 + 6 = 17 ;

x² = 17 , тому х = √17 ( x > 0 ) .

В - дь : х = √17 .

psamovol: а теперь как дать балы? Или они автоматически дают?

psamovol: я просто новенький

dobra888: Бали дають автоматично за ров'язання , а ви можете дати ДЯКУЮ .

psamovol: Ну тогда, я уже дал "Спасибо", так что ещё раз Спасибо!

Lisa123014: у тебя неправильна , ті не можеш скоротить √2 , а будет 11+6х(√2)

Lisa123014: (√2)"2´=11+12\2=11,5

Lisa123014: бо (√2)"2 це 2

Lisa123014: 2х6=12

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