Sos cứu mình vs ạ soss

`#LHuong`

`a)` `6/13+(-15/39)`

`=6/13-15/39`

`=6/13-5/13`

`=1/13`

`b)` `-8/18+(-15/27)`

`=-8/18-15/27`

`=-8/18-5/9`

`=-8/18-10/18`

`=-18/18`

`=-1`

`c)` `(-2)-(-5/8)`

`=(-2)+5/8`

`=-16/8+5/8`

`=-11/8`

`d)` `5/12-(3/-16)+3/4`

`=5/12+3/16+3/4`

`=(5/12+3/4)+3/16`

`=(5/12+9/12)+3/16`

`=7/6+3/16`

`=112/96+18/96`

`=130/96`

`=65/48`

`e)` `-3/17+(2/3+3/17)`

`=-3/17+2/3+3/17`

`=(-3/17+3/17)+2/3`

`=0+2/3`

`=2/3`

`f)` `-5/7+3/4+(-1/5)+(-2/7)+1/4`

`=[(-5/7)+(-2/7)]+(3/4+1/4)+(-1/5)`

`=(-7/7)+4/4+(-1/5)`

`=-1+1+(-1/5)`

`=0+(-1/5)`

`=-1/5`