tolong soal penjumlahan dan penguran pecahan

1. 5/7 + 2/9 = 45/63 + 14/63 = 59/63

2. 2½ + 1 2/5 = (2+1) 1/2+2/5 = 3 5/10 + 4/10 = 3 9/10

3. 11/4 - 3/5 = 55/20 - 12/20 = 43/20 = 2 3/20

4. 5 2/3 - 2 4/5 = (5-2) 2/3 - 4/5 = 3 10/15 - 12/15 = 3 -2/15

5. 7¼ - 3 4/5 - 1 1/6 = (7-3-1) (¼-4/5-1/6) = 3 (15/60 - 48/60 - 10/60) = 3 -43/60