Question

giúp mik với mn ơi

Answer 1

`= (2/9 + 7/9) + (1/5 + 4/5)`

`= 1 + 1`

`= 2`

Answer 2

a)2/9 + 1/5 + 7/9 + 4/5

= ( 2/9 + 7/9 ) + ( 1/5 + 4/5 ) 

= 9/9 + 5/5

= 1+1 = 2

b) 1/12 + 3/16 + 5/12 + 5/16

= ( 1/12 + 5/12 ) + ( 3/16 + 5/16)

= 6/12 + 8/16

= 1/2 + 1/2

= 1

Answer 3

`1/12 + 3/16 + 5/12 + 5/16`

`=(1/12 + 5/12 )+(3/16 + 5/16)`

`= 6/12+ 8/16`

`= 1/2 + 1/2`

`= 2/2=1`

Answer 4

                                   Giải: