Câu 1 (phần C)
a) 1/2 +1/3 +1/6
= 3/6 + 2/6 + 1/6
= 6/6
=1
b)5/12 + 5/6 - 3/4
= 5/12 + 10/12 - 9/12
= 15/12 - 9/12
= 6/12
= 1/2
c)1 - (1/5 + 1/2)
= 1 - (2/10 + 5/10)
= 1 - 7/10
= 3/10
Câu 2
a) 2/9 + 1/5 + 7/9 + 4/5
= (2/9 + 7/9 ) + (1/5 + 4/5)
= 1 + 1
= 2
b)1/12 + 3/16 + 5/12 + 5/16
= (1/12 + 5/12 ) + (3/16 + 5/16)
= 1/2 + 1/2
= 1