1.點(diǎn)M到點(diǎn)A(4,0),和點(diǎn)B(-4,0)距離的和12,點(diǎn)M的軌跡方程是什么?2.一動(dòng)點(diǎn)P到互相垂直平分的兩線段AB CD的端點(diǎn)的連線滿足PA的絕對(duì)值乘以PB的絕對(duì)值等于PC的決對(duì)值乘以PD的絕對(duì)值,求動(dòng)點(diǎn)P的軌跡方程