7.
已知\(M\)\((4,0)\),\(N\)\((1,0)\),曲线\(C\)上的任意一点\(P\)满足:\( \overset{→}{MN}· \overset{→}{MP}=6| \overset{→}{PN}| \).
\((\)Ⅰ\()\)求点\(P\)的轨迹方程;
\((\)Ⅱ\()\)过点\(N\)\((1,0)\)的直线与曲线\(C\)交于\(A\),\(B\)两点,交\(y\)轴于\(H\)点,设\( \overset{→}{HA} =\)\(λ\)1\( \overset{→}{AN} \),\( \overset{→}{HB} =\)\(λ\)2\( \overset{→}{BN} \),试问\(λ\)\({\,\!}_{1}+\)\(λ\)\({\,\!}_{2}\)是否为定值?如果是定值,请求出这个定值;如果不是定值,请说明理由.