vladawin2
15.10.2022 20:07

Даны координаты точек а, в, с. требуется: 1) записать векторы ав и ас в системе орт i, j и найти длины этих векторов. 2) найти орт вектора ав. 3) изобразить векторы ав и ас в координатной плоскости х0у. 4) найти вектора d1 = 3ab - 2ac и d2 = 2 ab + 3 ac аналитически и . а (-9; 6) в (3; 3) с (7; 19)

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Ответ:
Galerina
19.03.2021 11:54

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Ответ:
Gutlock
21.04.2022 11:11

Смотрите.

1) Обозначаем t — сколько времени они шли в первый день, тогда (t-1) — сколько во второй.

2) Теперь следующее соотношение — про 6 километров. Пускай в первый день они км, а во второй день — s2, тогда нам дано:

s1-s2=6.

3) Вспоминая, что расстояние=время*скорость (s=v*t), подставляем в эту формулу вместо s1 и s2:

(3,5*t)-(3*(t-1))=6.

Упрощаем:

3,5t-3t+3=6;

0,5t=3;

t=6.

ответ: Таким образом, в первый день они шли 6 часов. Во второй день — 6-1=5 (часов во второй день — 3*5 = 15 (км)

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