Векторы. №769 Атанасян Геометрия 9 класс

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№769 Отрезок ВВ1 – медиана треугольника АВС. Выразите векторы (В_1 С) ⃗, (ВВ_1 ) ⃗, (ВА) ⃗, (ВС) ⃗ через х ⃗=(АВ_1 ) ⃗ и у ⃗=(АВ) ⃗.

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