Respostas

2014-04-01T13:42:20-03:00
U=(2, -3)  ⇒3.u= (6, -9)
v=(1, -1)
w=(-2, 1)  ⇒2w=(-4, 2)


3u-v-w = (6, -9)-(1, -1)-(-4, 2) = (9, -6)

2014-04-01T13:54:55-03:00
3u= 3(2,-3)
3u=(6,-9)

v= (1,-1)

2w= 2(-2,1)
2w= (-4,2)