Resposta :
3.(2,-3) -1/2(1,-1) -1/2(-2,1)
(6,-9)(-1/2,+1/2)(1,-1/2)
(6.-1/2.1/1),(-9,+1/2,-1/2)
multiplica fazendo mmc.. temos (12-1+2/2) (-18+1-1/2)
= (13/2,-9)
(6,-9)(-1/2,+1/2)(1,-1/2)
(6.-1/2.1/1),(-9,+1/2,-1/2)
multiplica fazendo mmc.. temos (12-1+2/2) (-18+1-1/2)
= (13/2,-9)