0,5x(x – 3) = (x – 3)(1,5x – 1)

Đáp án:

`0,5x.(x - 3) = (x - 3).(1,5x - 1)`

`⇔ 0,5x.(x -3) - (x - 3).(1,5x - 1) = 0`

`⇔ (x- 3).[0,5x - (1,5x - 1)] = 0`

`⇔ (x - 3).(0,5x - 1,5x + 1) = 0`

`⇔ (x - 3).(1 - x) = 0`

`⇔`\(\left[ \begin{array}{l}x - 3 = 0\\1 - x = 0\end{array} \right.\)

`⇔`\(\left[ \begin{array}{l}x = 3\\x = 1\end{array} \right.\)

Vậy `S = {1;3}`

`#dariana`