Question

giúp mk nha =)

Answer 1

`[x+1]/[x-5]+[x-18]/[x-5]+[x+2]/[x-5]`     `ĐK: x \ne 5`

`=[x+1+x-18+x+2]/[x-5]`

`=[3x-15]/[x-5]`

`=[3(x-5)]/[x-5]=3`

Answer 2