A:i
B:doe
C:did
D:ha
(Ⅰ)求△ABM与△ABC的面积之比
(Ⅱ)若N为AB中点, AM→ 与 CN→ 交于点P且 AP→ =x AB→ +y AC→ (x,y∈R),求x+y的值.
配方x2﹣8x+____=(x﹣____)2.