giúp mình với ạ mình đang cần gấp ạ

`c)` `( 19/17 - 100/49 + 129/131 )/( 3/17 - 3/49 - 3/131 )`

`= ( 1 + 2/17 - 2 - 2/49 + 1 - 2/131 )/( 3/17 - 3/49 - 3/131 )`

`= ( 2/17 - 2/49 - 2/131 )/( 3/17 - 3/49 - 3/131 )`

`= [2( 1/17 - 1/49 - 1/131 )]/[3( 1/17 - 1/49 - 1/131 )]`

`= 2/3`

`#phamthanh`