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`\text{Đáp án + Giải thích các bước giải:}`

`1) (3 1/2 + 5 2/3) . 8/19 - 8/19 (2 1/2 + 4 2/3)`

`= (7/2 + 17/3) . 8/19 - 8/19 . (5/2 + 14/3)`

`= 55/6 . 8/19 - 8/19 . 43/6`

`= 8/19 . (55/6 - 43/6)`

`= 8/19 . 2`

`= 16/19`

`2) (7 1/3 + 2 1/2) . 9/23 - (3 1/3 + 4 1/2) . 9/23`

`= (22/3 + 5/2) . 9/23 - (10/3 + 9/2) . 9/23`

`= 59/6 . 9/23 - 47/6 . 9/23`

`= 9/23 . (59/6 - 47/6)`

`= 9/23 . 2`

`= 18/23`