Question

1 phần 2 cộng 13 phần 19 trừ 4 phần 9 cộng 6 phần 19 cộng 5 phần 18

Answer 1

`1/2+13/19−4/9+6/19+5/18`

`=9/18+13/19−8/18+6/19+5/18`

`=(9/18−8/18+5/18)+(13/19+6/19)`

`=1/3+1=4/3`

Answer 2

`1/2+13/19−4/9+6/19+5/18`

`=9/18+13/19−8/18+6/19+5/18`

`=(9/18−8/18+5/18)+(13/19+6/19)`

`=1/3+1`

`=1/3+3/3`

`=4/3`

Answer 3

` 1/2 + 13/19 - 4/9 + 6/19 + 5/18`

`= 1/2 -( 13/19 + 6/19)  -4/9 + 5/18`

`= 1/2 - 1 - 4/9 + 5/18`

` = 3/2 - 4/9 + 5/18`

` = 27/18 - 8/18 + 5/18`

` = 19/18 + 5/18`

` = 24/18 `

` = 4/3`