Resposta:
1 - a) 4/5 b)2/3 c)1/5 d)1/5 e) 15/20 f) 1/6 g)0 h)2/5
2 - 3/20
3- 17/20
Explicação passo-a-passo:
2 - 11/20 - 2/5 = 3/20
mmc(20;5)
20;5|2
10;5|2
5;5|5
1;1|_____
2² * 5 =20
3 - 3/5+1/4 = (12+5)/20 = 17/20
