如图,在梯形ABCD中,AD∥BC,AB=DC=3,P是BC上的一点,PE∥AB交AC于点E,PF∥CD交BD于点F.设PE、PF的长分别为m,n,x=m+n.那么当点P在边BC上移动时,x的值是否变化?若变化,求出x的取值范围;若不变,求出x的值,并
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![如图,在梯形ABCD中,AD∥BC,AB=DC=3,P是BC上的一点,PE∥AB交AC于点E,PF∥CD交BD于点F.设PE、PF的长分别为m,n,x=m+n.那么当点P在边BC上移动时,x的值是否变化?若变化,求出x的取值范围;若不变,求出x的值,并](/uploads/image/z/1617108-60-8.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E2%88%A5BC%2CAB%3DDC%3D3%2CP%E6%98%AFBC%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2CPE%E2%88%A5AB%E4%BA%A4AC%E4%BA%8E%E7%82%B9E%2CPF%E2%88%A5CD%E4%BA%A4BD%E4%BA%8E%E7%82%B9F.%E8%AE%BEPE%E3%80%81PF%E7%9A%84%E9%95%BF%E5%88%86%E5%88%AB%E4%B8%BAm%2Cn%2Cx%3Dm%2Bn.%E9%82%A3%E4%B9%88%E5%BD%93%E7%82%B9P%E5%9C%A8%E8%BE%B9BC%E4%B8%8A%E7%A7%BB%E5%8A%A8%E6%97%B6%2Cx%E7%9A%84%E5%80%BC%E6%98%AF%E5%90%A6%E5%8F%98%E5%8C%96%3F%E8%8B%A5%E5%8F%98%E5%8C%96%2C%E6%B1%82%E5%87%BAx%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%9B%E8%8B%A5%E4%B8%8D%E5%8F%98%2C%E6%B1%82%E5%87%BAx%E7%9A%84%E5%80%BC%2C%E5%B9%B6)
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