Odpowiedź:
13 1/7 - 0,3 = 13 1/7 - 3/10 = 13 10/70 - 21/70 = 12 80/70 - 21/70 = 12 59/70
0,4 + 3 2/7 = 4/10 + 3 3/7 = 28/70 + 3 30/70 = 3 58/70 = 3 29/35
3 1/7 + 0,2 = 3 1/7 + 2/10 = 3 10/70 + 14/70 = 3 24/70 = 3 12/35
3,4 * 1/3 = 34/10 * 1/3 = 34/30 = 1 4/30 = 1 2/15
2,7 * 1/3 = 27/10 * 1/3 = 9/10
6,5 * 1/13 = 65/10 * 1/13 = 13/2 * 1/13 = 1/2 * 1 = 1/2
