若点M是ABC所在平面内一点,且满足:. (1)求ABM与ABC的面积之比. (

若点MABC所在平面内一点,且满足:.

1)求ABMABC的面积之比.

2)若NAB中点,AMCN交于点O,设,求的值.

答案

解(1)由可知MBC三点共线

如图令

  即面积之比为14

2)由  

OMA三点共线及ONC三点共线

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