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Giải thích các bước giải:

a)$\frac{x-5}{3}$ `=` $\frac{2x-1}{4}$ 

`=> 3 ( 2 x − 1 ) = 4 ( x − 5 )`

`=> 6 x − 3 = 4 x − 20`

`=> 6 x − 4 x = − 20 + 3`

`=>2x=-17`

`=> x = − 17/ 2`

b)ĐKXĐ: `x` $\notin$ `{ 2 ; 1 }`

$\frac{x + 3}{x-2}$`=` $\frac{x-2}{x-1}$

`=> ( x + 3 ) ( x − 1 ) = ( x − 2 ) ( x − 2 )`

`=> x^ 2 − x + 3 x − 3 = x^ 2 − 4 x + 4`

`=>2x-3=-4x+4`

`=>6x=7`

`=> x = 7/ 6` (nhận)