Explicação passo a passo:

a

1/3 * 2/2 = 2/6

1/3 * 3/3 = 3/9

1/3 * 4/4 = 4/12

1/3 * 5/5 = 5/15

1/3 * 6/6 = 6/18

b

2/3 * 2/2 = 4/6

2/3 * 3/3 =6/9

2/3 * 4/4 = 8/12

2/3 * 5/5 = 10/15

2/3 * 6/6 = 12/18

c

3/5 * 2/2 = 6/10

3/5* 3/3 = 9/15

3/5 * 4/4 = 12/20

3/5 *5/5 = 15/25

3/5 * 6/6 = 18/30

d

4/6 : 2/2 = 2/3

4/6 * 2/2 = 8/12

4/6 * 3/3 = 12/18

4/6 * 4/4 = 16/24

4/6 * 5/5 = 20/30