giúp mình với ạ mình đang cần gấp ạ

`a ) 60/85 : 45/34 + 20/18 xx 42/50`

`= 12/17 xx 34/45 + 10/9 xx 21/25`

`= 8/15 + 14/15`

`= 22/15`

`b ) 60/75 xx 25% : 3/5 - 2/15`

`= 4/5 xx 1/4 xx 5/3 - 2/15`

`= 1/5 xx 5/3 - 2/15`

`= 1/3 - 2/15`

`= 1/5`

`c ) 3 2/3 : 2 3/4 + 9/12 xx 8/27 - 1 1/6`

`= 11/3 : 11/4 +2/9 - 7/6`

`= 4/3 + 2/9 - 7/6`

`= 14/9 - 7/6`

`= 7/18`

`#dtkc`