Даны точки A(1;1) ,(3;-1),C(7;3). Найдите координаты и модуль вектора :1) АВ|,АС|,ВС|; 2)АВ|+2ВС|; 3)3АВ|-2АС; 4)АВ|+2|ВС-3|АС.
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