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URGENT!!!!!!!!!!!!!Fie A(-2,-4),B(-3,5),C(3,6),D(5,-3).Sa se determine coordonatelor vectorilor:
b)AB+2BC+3CD
c)OA+3OD+5BC
d)2(AB+CD)+3(AC+BD)

Răspuns :

Mimisimi
Formula :   (Xb-Xa)vector i + (Yb-Ya)vector i)
b)8i+2×17i +3×(-17i)=8i+34i-21i=21i
c)-6i+3×2i+5×17i=-6i+6i+85i=85 i
d)2(8i-7i)+3(15i +0)=2i +45i=47i