Giải thích các bước giải:
Câu `2.`
`a)`
`2.(x-1/2)-0,75=5/4`
`=>2.(x-1/2)-75/100=5/4`
`=>2.(x-1/2)-3/4=5/4`
`=>2.(x-1/2)=5/4+3/4`
`=>2.(x-1/2)=8/4`
`=>2.(x-1/2)=2`
`=>x-1/2=2:2`
`=>x-1/2=1`
`=>x=1+1/2`
`=>x=2/2+1/2`
`=>x=3/2`
Vậy `x=3/2`
`b)`
`(x-1)/(x-5)=6/7(x\ne5)`
`=>(x-1).7=(x-5).6`
`=>7.x-1.7=6.x-5.6`
`=>7x-7=6x-30`
`=>7x-6x=-30+7`
`=>x.(7-6)=-23`
`=>x=-23`
Vậy `x=-23`
