Đáp án:
`k. \frac{13}{x-1}+\frac{5}{2x-2}-\frac{6}{3x-3}` (`x\ne1`)
`= \frac{13}{x-1}+\frac{5}{2(x-1)}-\frac{6}{3(x-1)}`
`= \frac{13}{x-1}+\frac{5}{2(x-1)}-\frac{2}{x-1}`
`= \frac{27}{2(x-1)}`
`= \frac{27}{2x-2}`
`m. (3/2-2/-5):x-1/2=3/2` (`x\ne0`)
`-> 19/10xx1/x-1/2=3/2`
`-> 19/(10x)-1/2=3/2`
`-> 19/(10x)=2`
`-> 19=20x`
`-> x=19/20`
Vậy `x=19/20`
`n. (3/2-5/11-3/13)(2x-2)=(-3/4+5/22+3/26)`
`-> 233/286 xx2(x-1)=-233/572`
`-> 233/143 (x-1)=-233/572`
`-> (233x)/143-233/143=-233/572`
`-> 932x-932=-233`
`-> 932x=699`
`-> x=3/4`
Vậy `x=3/4`
