. Enumere a segunda coluna de

acordo com a 1ª:

(1) x+x ( ) 3c

(2) y-y ( ) 6w

(3) 2c-2c+3c ( ) 3t

(4) d+d+d+2d ( ) 9f

(5) w-2w+5w ( ) a

(6) t-t+3t ( ) 4x

(7) x+x x+x ( ) 2k

(8) a+a-a-a+a ( ) 5d

(9) 3f+2f-f+5f ( ) 0

(10) 7k-5k ( ) 2​