a) 9/8 + 7/8 - (17/7 - 3/7) = 16/8 - 14/7 = 2 - 2 = 0
b) (15,27 - 1,14) - 4,13 = 14,13 - 4,13 = 10
c) (60 - 13,75) - 26,25 = 46,25 - 26,25= 20
b,15,27-4,13-1,14=15,27-(4,13+1,14)
=15,27-5,27
=10
c,60-13,75-26,25=60-(13,75+26,25)
=60-40
=20
Còn ý a thì mk chịu!