1.
1) 3,5 + 2 1/3 = 3 5/10 + 2 1/3
= 3 1/2 + 2 1/3 = 3 3/6 + 2 2/6 = 5 5/6
2) 3,5 -2 1/3 = 3 1/2 - 2 1/3 = 3 3/6 - 2 2/6 = 1 1/6
3) 5 5/6 : 1 1/6 = 35/6 : 7/6 = 35/6 * 6/7 = 35/7 = 5
2.
1) 5,6 - 3 1/3 = 5 6/10 - 3 1/3 = 5 3/5 - 3 1/3 = 5 9/15 - 3 5/15 = 2 4/15
2) 1,5 + 1 1/3 = 1 5/10 + 1 1/3 = 1 1/2 + 1 1/3 = 1 3/6 + 1 2/6 = 2 5/6
3) 2 4/15 : 2 5/6 = 34/15 : 17/6 = 34/15 * 6/17 = 4/5
3.
1) 16 - 8 1/3 = 15 3/3 - 25/3 = 48/3 - 25/3 = 23/3
2) 23/3 : (-2 5/9) = 23/3 * (-9/23) = - 9/3 = -3
4.
1) 15 - 9 2/3 = 14 3/3 - 9 2/3 = 5 1/3
2) 5 1/3 : (-3 5/9) = 16/3 * (-9/32) = - 3/2 = - 1 1/2