De acordo com as coordenadas cartesianas no espaço bidimensional Considere os pontos : A = (1, 2) B = (6, 7) C = (-4, 9) D = (3,-7) M...

a) A + C + D = (1+[-4]+3, 2+9+[-7])=

                       = (1-4+3, 2+9-7)= (0, 4)

b) MA + MB = 3. (1,2) + 3.(6,7)=

                    = (3,6) + (18, 21)= (3+18, 6+21)                     = (21, 27)

c) MC – NA = 3. (-4,9) - 5. (1,2)=

                     = (-12,27) - (5, 10)

                     = (-17, 17)

d) D – A + NC = (3, -7) - (1, 2) + 5·(-4, 9)

                         = (2, -9) + (-20, 45)

                         = (-18, 36) 

e) NA – MD = 5·(1, 2) - 3·(3, -7)

                     = (5, 10) - (9, -21)

                     = (-4, 31)