共50条信息
当直线\(l\)和\(l_{2}\)的斜率都存在时,一定有\(k_{1}=k_{2}⇒l_{1}/\!/l_{2}.(\) \()\)
已知直线\(l_{1}\):\(x{+}my{+}7{=}0\)和\(l_{2}\):\((m{-}2)x{+}3y{+}2m{=}0\)互相平行,则实数\(m{=}\)
若两直线\(3\)\(x\)\(+\)\(y\)\(-3=0\)与\(6\)\(x\)\(+\)\(my\)\(+1=0\)平行,则\(m\)\(=\) \(;\)
直线\(l\)的斜率为\(2\),\(l_{1}/\!/l_{2}\),直线\(l_{2}\)过点\((-1,1)\)且与\(y\)轴交于点\(P\),则\(P\)点坐标为\((\) \()\)
“\(a=2\)”是直线“\({{l}_{1}}:ax+2y-6=0,{{l}_{2}}:x+(a-1)y+{{a}^{2}}-1=0\)平行”的( )条件
直线\({l}_{1:}(k-3)x+(4-k)y+1=0,与{l}_{2:}2(k-3)-2y+3=0 \)平行,则\(k\)的值是\((\) \()\)
已知直线\({{l}_{1}}\)的斜率为\(3\),直线\({{l}_{2}}\)经过点\(A(1,2)\),\(B(2,\)\(a\)\()\),若直线\({{l}_{1}}/\!/{{l}_{2}}\),则\(a=\) __________;若\({{l}_{1}}\bot {{l}_{2}}\),则\(a=\) __________;
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