Giúp mình với ak ! Mình đang cần gấp

Bài `1:`

`a) 6/7 + 5/8 = 48/56 + 35/56 = (48+35)/56 = 83/56`

`b) 3/5 - 3/8 = 24/40 - 15/40 = (24-15)/40 = 9/40`

`c) 1/4 + 5/6 = 3/12 + 10/12 = (3+10)/12 = 13/12`

`d) 4/9 - 1/6 = 8/18 - 3/18 = (8-3)/18 = 5/18`

Bài `2:`

`a) 3 + 2/5 = 3/1 + 2/5 = 15/5 + 2/5 = (15+2)/5 = 17/5`

`b) 4 - 5/7 = 4/1 - 5/7 = 28/7 - 5/7 = (28-5)/7 = 23/7`

`c) 1 - (2/5 + 1/3) = 1 - (6/15 + 5/15) = 1 - 11/15 = 1/1 - 11/15 = 15/15 - 11/15 = 4/15`

$# 𝓖𝓻𝓮𝓮𝓷$