Предмет: Геометрия, автор: gpg1551

Каковы координаты вектора, который разложен на координатные векторы i→ и j→ следующим образом:   1. a→=20⋅i→+13⋅j→?       a→{;}.   2. b→=−25⋅j→+8⋅i→?       b→{;}.   3. c→=−11⋅i→?       c→{;}. ​

Ответы

Автор ответа: dobra888
0

Ответ:

Объяснение:

1. a→=20⋅i→+13⋅j→?         a→{20 ; 13 }.                                                                         2. b→=−25⋅j→+8⋅i→?       b→{8 ; - 25}.                                                                         3. c→=−11⋅i→?                  c→{- 11 ; 0 }. ​

Для вектора на площині коефіцієнт перед одиничним вектором  і→

осі Ох  є першою координатою , а коефіцієнт перед одиничним вектором  j→  осі Оу є другою координатою вектора :

а→ = а₁* i  + a₂ * j ,    а→{ a₁ ; a₂ } .  

Якщо якогось одиничного вектора немає в запису , тоді для нього

коефіцієнт дорівнює  0 .

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