After the play had finished, we for a while in the theatre hoping to catch sight of the actors. 戏散场后,我们逗留在剧院,希望能看到演员。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【简答题】已知:△ABC是任意三角形. (1)如图1所示,点M、P、N分别是边AB、BC、CA的中点,求证:∠MPN=∠A. (2)如图2所示,点M、N分别在边AB、AC上,且 AM AB = 1 3 , AN AC = 1 3 ,点P 1 、P 2 是边BC的三等分点,你认为∠MP 1 N+∠MP 2 N=∠A是否正确?请说明你的理由. (3)如图3所示,点M、N分别在边AB、AC上,且 AM AB = ...