July 2021 0 17 Report
1)углы между векторами a,b и c равны 60 градусов. их модули равны 1.
скалярное произведение (a+2b)(c-a)=?
2)ABCD параллелограмм.O-пересечение диагоналей.M-середина BO.AB=m;AC=n.
Выразить вектор BM через m и n.
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