mn giúp e với ạ cần gấppp

`1)`

`a) 2/9+5/18-1/3`

`= 4/18+5/18-6/18`

`=3/18=1/6`

`b)9/7 . 9/11 + 9/7 . 3/11 - 9/7 . 1/11`

`=9/7(9/11+3/11-1/11)`

`=9/7 . 1`

`=9/7`

`c) (-2/3)^2 - 50% + 2 1/3 - 3,5`

`= 4/9 - 1/2 + 7/3 - 7/2`

`=8/18-9/18+42/18-63/18`

`=-22/18=-11/9`

`2)`

`a) x + 1/2 = 3/8`

`x=3/8 - 4/8`

`x=-1/8`

`b)7/6 : (4/5 + 1/5 x)=7`

`4/5 + 1/5 x = 7/6 . 1/7`

`4/5+1/5 x=1/6`

`1/5 x = 1/6-4/5`

`1/5 x=5/30-24/30`

`1/5 x=-19/30`

`x=-19/30 : 1/5`

`x= -19/30 . 5`

`x=-19/6`

`#BaoNgoc`