a. 2/5+ 8/5= 10/5= 2
8- 12/7= 56/7- 12/7= 44/7
7/10- 2/5= 7/10- 4/10= 3/10
3/8+ 4/7= 21/56+ 32/56= 53/56
9/7- 3/7= 6/7
8/5- 5/8= 64/40- 25/40= 39/40
4/9+ 9/4= 16/36+ 81/36= 97/36
3/5+ 1/4+ 5/6= 36/60+ 15/60+ 50/60= 101/60
12/5- 2= 12/5- 10/5= 2/5
6/7+ 3= 6/7+ 21/7= 27/7
1/3+ 2/5+ 3/4= 20/60+ 24/60+ 45/60= 89/60
2/3- 1/9- 1/6= 24/36- 4/36- 6/36= 14/36= 7/18
4+ 9/10= 40/10+ 9/10= 49/10
5/3+ 2/7= 15/21+ 6/21= 21/21= 1
4/7- 1/5+ 2/3= 60/105- 21/105+ 70/105= 109/105
vote 5 sao và câu trả lời hay nhất nha