

Bài 1: Cho 2 đường thẳng
[tex](d_{1}): y = ({m}^2-1).x+m+2 (m\neq +,- 1)[/tex]
[tex](d_{1}): y = ({m}^2-1).x+m+2 (m\neq +,- 1)[/tex]
[tex](d_{1}): y = ({m}^2-1).x+m+2 (m\neq +,- 1)[/tex]
[tex](d_{1}): y = ({m}^2-1).x+m+2 (m\neq +,- 1)[/tex]