№770. Дан параллелограмм ABCD. Выразите вектор АС через векторы а и b , если
770 Дан параллелограмм ABCD. Выразите вектор АС через векторы а и b , если: а) а=АВ, b=BC;б) а =СВ, b=CD; в) а =АВ, b = DA.
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