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Va rog este urgent E7 b)....

Va Rog Este Urgent E7 B class=

Răspuns :

AB vector = (Xb-Xa)i + (Yb-Ya)j = (2-3)i + (5-1)j = -i+4j

CD vector = (Xd-Xc)i + (Yd-Yc)j = (-3+1)i + (-5-3)j = -2i-8j

AB vector + CD vector = -i+4j+(-2i-8j) = -i+4j-2i-8j = -3i-4j