`1) -8/5:(1+2/3)`

`= -8/5 : 5/3`

`= -8/5xx3/5`

`= -24/25`

`2) 3/4:3 3/4. (1/2-1)`

`=3(3/4-3/4)(1/2-2/2)`

`= -3/2`

`3)45:2 4/7+1/2-1 1/4`

`= 45xx7/18+ ( 2/4-5/4)`

`= 35/2- 3/4`

`= 67/4 `

`4)3/4:2 1/5-1/4. (-7)`

`= 3/4xx5/11 -7/4`

`= 15/44+7/4`

`= 23/11`

`5)2/5+5/4+(-2)/5+5/4+(-5)/2`

`= [(-2)/5+2/5]+(5/4+5/4)+(-10/4)`

`= 0`

`6) (-1/9+-15/23)-(5/6+8/23-10/9)`

`= (10/9-1/9)-(15/23+8/23) -5/6`

`= 1-1-5/6`

`=-5/6`

`7)-1/2. 18/22+4/22. -1/2`

`= -1/2(18/22+4/22)`

`= -1/2`

`8)13/27. 19/17-13/27. 2/17+5/27`

`=13/27(19/17-2/17)+5/27`

`= 18/27`

`9)6/7+1/7. 2/7+1/7. 5/7`

`= 1/7(2/7+5/7)+6/7`

`= 1/7+6/7`

`=1`

`Otama2k9`