1)Даны точки M (–5; 7), N (3; –1). Найдите координаты вектора MN.
2) Даны точки N (3; –1), P (3; 5). Найдите длину вектора NP.
3) Даны точки M (–5; 7), N (3; –1). Найдите координаты середины MN
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