如图,已知AB是圆o的直径,点C在圆o上,过点C的直线与AB的延长线交于点P,AC=PC,∠COB=2∠PCBQ:点M是弧AB的中点,CM交AB于点N,若AB=4,求MN×MC的值(前面已证PC是圆O的切线、BC=1/2AB,看看还能用的上吧.请
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![如图,已知AB是圆o的直径,点C在圆o上,过点C的直线与AB的延长线交于点P,AC=PC,∠COB=2∠PCBQ:点M是弧AB的中点,CM交AB于点N,若AB=4,求MN×MC的值(前面已证PC是圆O的切线、BC=1/2AB,看看还能用的上吧.请](/uploads/image/z/10979613-45-3.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5AB%E6%98%AF%E5%9C%86o%E7%9A%84%E7%9B%B4%E5%BE%84%2C%E7%82%B9C%E5%9C%A8%E5%9C%86o%E4%B8%8A%2C%E8%BF%87%E7%82%B9C%E7%9A%84%E7%9B%B4%E7%BA%BF%E4%B8%8EAB%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4%E4%BA%8E%E7%82%B9P%2CAC%3DPC%2C%E2%88%A0COB%3D2%E2%88%A0PCBQ%EF%BC%9A%E7%82%B9M%E6%98%AF%E5%BC%A7AB%E7%9A%84%E4%B8%AD%E7%82%B9%2CCM%E4%BA%A4AB%E4%BA%8E%E7%82%B9N%2C%E8%8B%A5AB%3D4%2C%E6%B1%82MN%C3%97MC%E7%9A%84%E5%80%BC%EF%BC%88%E5%89%8D%E9%9D%A2%E5%B7%B2%E8%AF%81PC%E6%98%AF%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF%E3%80%81BC%3D1%2F2AB%2C%E7%9C%8B%E7%9C%8B%E8%BF%98%E8%83%BD%E7%94%A8%E7%9A%84%E4%B8%8A%E5%90%A7.%E8%AF%B7)
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