已知:如图,梯形ABCD中,AD//BC,AB=DC=3,P是BC上一点,PE//AB交AC于E,PE//CD交AC于E,PE//CD于F,设PE,PF的长为m,.n,x=m+n.那么当P点在BC边上移动时,x的值是否变化?若变化,求出x的取值范围;若不变,求出x值,并说明理
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![已知:如图,梯形ABCD中,AD//BC,AB=DC=3,P是BC上一点,PE//AB交AC于E,PE//CD交AC于E,PE//CD于F,设PE,PF的长为m,.n,x=m+n.那么当P点在BC边上移动时,x的值是否变化?若变化,求出x的取值范围;若不变,求出x值,并说明理](/uploads/image/z/2095085-29-5.jpg?t=%E5%B7%B2%E7%9F%A5%3A%E5%A6%82%E5%9B%BE%2C%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%2F%2FBC%2CAB%3DDC%3D3%2CP%E6%98%AFBC%E4%B8%8A%E4%B8%80%E7%82%B9%2CPE%2F%2FAB%E4%BA%A4AC%E4%BA%8EE%2CPE%2F%2FCD%E4%BA%A4AC%E4%BA%8EE%2CPE%2F%2FCD%E4%BA%8EF%2C%E8%AE%BEPE%2CPF%E7%9A%84%E9%95%BF%E4%B8%BAm%2C.n%2Cx%3Dm%2Bn.%E9%82%A3%E4%B9%88%E5%BD%93P%E7%82%B9%E5%9C%A8BC%E8%BE%B9%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%3B%E8%8B%A5%E4%B8%8D%E5%8F%98%2C%E6%B1%82%E5%87%BAx%E5%80%BC%2C%E5%B9%B6%E8%AF%B4%E6%98%8E%E7%90%86)
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