[ 1/3 ( 6/5 - 9/4 ) - 7/5 ( 15/14 + 5/7 ) ] : ( 1/2 - 1/3 + 5/6) giải nhanh giúp mình nha các tình iu

`[ 1/3 ( 6/5 - 9/4 ) - 7/5 ( 15/14 + 5/7 ) ] : ( 1/2 - 1/3 + 5/6 )`

`= [ 1/3 ( 24/20 - 45/20 ) - 7/5 ( 15/14 + 10/14 ) : ( 3/6 - 2/6 + 5/6 )`

`= [ 1/3 . (-21)/20 - 7/5 . 25/14 ] : ( 1/6 + 5/6 )`

`= [ (-7)/20 - 5/2 ] : 1`

`= [ (-7)/20 - 50/20 ] : 1`

`= (-57)/20 : 1`

`= (-57)/20`