已知:梯形ABCD中,AB//CD,BC⊥AB,AB=AD,联结BD(如图1),点P沿梯形的边,从点A→B→C→D→A移动,设点P移动距离为x,BP=y.求证1.∠A=2∠CBD2.当点P从点A移动到点C时,y与x的函数关系如图2中的折现MNQ所示,试
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![已知:梯形ABCD中,AB//CD,BC⊥AB,AB=AD,联结BD(如图1),点P沿梯形的边,从点A→B→C→D→A移动,设点P移动距离为x,BP=y.求证1.∠A=2∠CBD2.当点P从点A移动到点C时,y与x的函数关系如图2中的折现MNQ所示,试](/uploads/image/z/12658475-11-5.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9A%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAB%2F%2FCD%2CBC%E2%8A%A5AB%2CAB%3DAD%2C%E8%81%94%E7%BB%93BD%EF%BC%88%E5%A6%82%E5%9B%BE1%29%2C%E7%82%B9P%E6%B2%BF%E6%A2%AF%E5%BD%A2%E7%9A%84%E8%BE%B9%2C%E4%BB%8E%E7%82%B9A%E2%86%92B%E2%86%92C%E2%86%92D%E2%86%92A%E7%A7%BB%E5%8A%A8%2C%E8%AE%BE%E7%82%B9P%E7%A7%BB%E5%8A%A8%E8%B7%9D%E7%A6%BB%E4%B8%BAx%2CBP%3Dy.%E6%B1%82%E8%AF%811.%E2%88%A0A%3D2%E2%88%A0CBD2.%E5%BD%93%E7%82%B9P%E4%BB%8E%E7%82%B9A%E7%A7%BB%E5%8A%A8%E5%88%B0%E7%82%B9C%E6%97%B6%2Cy%E4%B8%8Ex%E7%9A%84%E5%87%BD%E6%95%B0%E5%85%B3%E7%B3%BB%E5%A6%82%E5%9B%BE2%E4%B8%AD%E7%9A%84%E6%8A%98%E7%8E%B0MNQ%E6%89%80%E7%A4%BA%2C%E8%AF%95)
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