Question

[Bùi Anh Đào]

rút gọn rồi tính

2/5+9/15

15/45+25/30

28/32+45/72

8/28+5/30

giúp với

Answer 1

[⭐Hannie⭐]

`2/5 + 9/15= 2/5 + 3/5=5/5=1`

`15/45 + 25/30= 1/3 + 5/6= 2/6+5/6=7/6`

`28/32 + 45/72=7/8+ 5/8=12/8=3/2`

`8/28 + 5/30= 2/7 + 1/6= 12/42 + 7/42= 19/42`