已知角MON=40度,P为内角一定点,A,B分别在射线OM,ON上,当三角形PAB周长取得最小值时,求∠APB的度数.
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![已知角MON=40度,P为内角一定点,A,B分别在射线OM,ON上,当三角形PAB周长取得最小值时,求∠APB的度数.](/uploads/image/z/12558999-39-9.jpg?t=%E5%B7%B2%E7%9F%A5%E8%A7%92MON%3D40%E5%BA%A6%2CP%E4%B8%BA%E5%86%85%E8%A7%92%E4%B8%80%E5%AE%9A%E7%82%B9%2CA%2CB%E5%88%86%E5%88%AB%E5%9C%A8%E5%B0%84%E7%BA%BFOM%2CON%E4%B8%8A%2C%E5%BD%93%E4%B8%89%E8%A7%92%E5%BD%A2PAB%E5%91%A8%E9%95%BF%E5%8F%96%E5%BE%97%E6%9C%80%E5%B0%8F%E5%80%BC%E6%97%B6%2C%E6%B1%82%E2%88%A0APB%E7%9A%84%E5%BA%A6%E6%95%B0.)
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