) 3 12/17 + 2 5/17 = 6
2) 15:6= 2,5
3) 4,2 - 2 3/5= 4 2/10 - 2 6/10 = 3 12/10 - 2 6/10 = 1 6/10 = 1 3/5
4) 1 3/5 : 4 = 9/10
5) 2,5 + 9/10 = 2 5/10 + 9/10 = 2 14/10 = 2 4/10 = 2 2/5
) 3 12/17 + 2 5/17 = 6
2) 15:6= 2,5
3) 4,2 - 2 3/5= 4 2/10 - 2 6/10 = 3 12/10 - 2 6/10 = 1 6/10 = 1 3/5
4) 1 3/5 : 4 = 9/10
5) 2,5 + 9/10 = 2 5/10 + 9/10 = 2 14/10 = 2 4/10 = 2 2/5