如图所示,在直角梯形ABCD中,AD//BC,∠A=90°,AB=12,BC=21,动点P从点B出发如图所示,在直角梯形ABCD中,AD‖BC,∠A=90°,AB=12,BC=21,AD=16,动点P从点B出发,沿射线BC的方向以每秒2个单位的速度运动,动点Q同时从
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![如图所示,在直角梯形ABCD中,AD//BC,∠A=90°,AB=12,BC=21,动点P从点B出发如图所示,在直角梯形ABCD中,AD‖BC,∠A=90°,AB=12,BC=21,AD=16,动点P从点B出发,沿射线BC的方向以每秒2个单位的速度运动,动点Q同时从](/uploads/image/z/1099445-5-5.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%2F%2FBC%2C%E2%88%A0A%3D90%C2%B0%2CAB%3D12%2CBC%3D21%2C%E5%8A%A8%E7%82%B9P%E4%BB%8E%E7%82%B9B%E5%87%BA%E5%8F%91%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E2%80%96BC%2C%E2%88%A0A%3D90%C2%B0%2CAB%3D12%2CBC%3D21%2CAD%3D16%2C%E5%8A%A8%E7%82%B9P%E4%BB%8E%E7%82%B9B%E5%87%BA%E5%8F%91%2C%E6%B2%BF%E5%B0%84%E7%BA%BFBC%E7%9A%84%E6%96%B9%E5%90%91%E4%BB%A5%E6%AF%8F%E7%A7%922%E4%B8%AA%E5%8D%95%E4%BD%8D%E7%9A%84%E9%80%9F%E5%BA%A6%E8%BF%90%E5%8A%A8%2C%E5%8A%A8%E7%82%B9Q%E5%90%8C%E6%97%B6%E4%BB%8E)
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