B为线段OA的中点,P为以O为圆心,OB为半径的圆上的动点,当PA的中点Q落在⊙O上时,如图,则cos∠OQB的值等于A:1/2 B:1/3 C:1/4 D:2/3
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![B为线段OA的中点,P为以O为圆心,OB为半径的圆上的动点,当PA的中点Q落在⊙O上时,如图,则cos∠OQB的值等于A:1/2 B:1/3 C:1/4 D:2/3](/uploads/image/z/7013501-53-1.jpg?t=B%E4%B8%BA%E7%BA%BF%E6%AE%B5OA%E7%9A%84%E4%B8%AD%E7%82%B9%2CP%E4%B8%BA%E4%BB%A5O%E4%B8%BA%E5%9C%86%E5%BF%83%2COB%E4%B8%BA%E5%8D%8A%E5%BE%84%E7%9A%84%E5%9C%86%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2C%E5%BD%93PA%E7%9A%84%E4%B8%AD%E7%82%B9Q%E8%90%BD%E5%9C%A8%E2%8A%99O%E4%B8%8A%E6%97%B6%2C%E5%A6%82%E5%9B%BE%2C%E5%88%99cos%E2%88%A0OQB%E7%9A%84%E5%80%BC%E7%AD%89%E4%BA%8EA%EF%BC%9A1%2F2+++++++++++++++++++++++++++B%EF%BC%9A1%2F3++++++++++++++++++++++C%EF%BC%9A1%2F4++++++++++++++++++++++++++++++D%EF%BC%9A2%2F3)
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