giúp mik với 4/9 * 5/9 + 2021/2022 * 10/9 – 2021/2022 * 5/9

`4/9 × 5/9 + 2021/2022 × 10/9 – 2021/2022 × 5/9`

`= 4/9 × 5/9 + 2021/2022 × ( 10/9 – 5/9 )`

`= 4/9 × 5/9 + 2021/2022 × 5/9`

`= 5/9 × ( 4/9 + 2021/2022 )`

`= 5/9 × 26277/16198`

`= 43795/54594`

`#dtkc`