⑩天掌 Teaching Plan on Advanced Mathematics k 4-j-3k 2-13 因此,所给直线的对称式方程为 x-1 y +2 1-3 Z+2 3 得所给直线的参数方程为 x=1+4t 2-3t 返 tianjin polytechnic dmivendityTianjin Polytechnic University Teaching Plan on Advanced Mathematics 4 3 . 2 1 3 1 2 1 1 1 i j k i j k s n n = − − − =  = 因此，所给直线的对称式方程为 3 2 4 1 1 − + = − = x − y z 令 t x y z = − + = − = − 3 2 4 1 1 得所给直线的参数方程为      = − − = − = + 2 3 , , 1 4 , z t y t x t 返回