1 zadanie prosze obliczcie jak najszybciej i z obliczeniami daje naj

7/9 + 4/9 = 11/9 = 1 2/9 1 2/7 + 5/7 = 1 7/7 = 2 2 2/5 + 3 3/5 = 5 5/5 = 6 1 - 1/3 = 3/3 - 1/3 = 2/3 1 - 6/11 = 11/11 - 6/11 = 5/11 1 - 19/25 = 25/25 - 19/25 = 6/25 4/5 + 2/5 = 6/5 = 1 1/5 3/4 + 3/4 = 6/4 = 1 2/4 = 1 1/2 3/4 - 1/2 = 3/4 - 2/4 = 1/4 8 - 1/4 = 7 4/4 - 1/4 = 7 3/4 5 - 3/7 = 4 7/7 - 3/7 = 4 4/7 10 - 2/5 = 9 5/5 - 2/5 = 9 3/5 5 7/9 - 4 2/9 = 1 5/9 6 - 2 7/8 = 5 8/8 - 2 7/8 = 3 1/8 2 1/5 - 2/5 = 1 6/5 - 2/5 = 1 4/5