如图,一张长方形纸片ABCD,AB=3cm,BC=acm(a>3),动点M在线段CD上,从点C出发,向点D运动,同时,动点N在线段BC上,也从点C出发,向点B运动,它们的速度都为1cm/s(当点M到达终点D时,点N随之停止运动)连
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![如图,一张长方形纸片ABCD,AB=3cm,BC=acm(a>3),动点M在线段CD上,从点C出发,向点D运动,同时,动点N在线段BC上,也从点C出发,向点B运动,它们的速度都为1cm/s(当点M到达终点D时,点N随之停止运动)连](/uploads/image/z/5225826-66-6.jpg?t=%E5%A6%82%E5%9B%BE%2C%E4%B8%80%E5%BC%A0%E9%95%BF%E6%96%B9%E5%BD%A2%E7%BA%B8%E7%89%87ABCD%2CAB%3D3cm%2CBC%3Dacm%EF%BC%88a%26gt%3B3%EF%BC%89%2C%E5%8A%A8%E7%82%B9M%E5%9C%A8%E7%BA%BF%E6%AE%B5CD%E4%B8%8A%2C%E4%BB%8E%E7%82%B9C%E5%87%BA%E5%8F%91%2C%E5%90%91%E7%82%B9D%E8%BF%90%E5%8A%A8%2C%E5%90%8C%E6%97%B6%2C%E5%8A%A8%E7%82%B9N%E5%9C%A8%E7%BA%BF%E6%AE%B5BC%E4%B8%8A%2C%E4%B9%9F%E4%BB%8E%E7%82%B9C%E5%87%BA%E5%8F%91%2C%E5%90%91%E7%82%B9B%E8%BF%90%E5%8A%A8%2C%E5%AE%83%E4%BB%AC%E7%9A%84%E9%80%9F%E5%BA%A6%E9%83%BD%E4%B8%BA1cm%2Fs%EF%BC%88%E5%BD%93%E7%82%B9M%E5%88%B0%E8%BE%BE%E7%BB%88%E7%82%B9D%E6%97%B6%2C%E7%82%B9N%E9%9A%8F%E4%B9%8B%E5%81%9C%E6%AD%A2%E8%BF%90%E5%8A%A8%EF%BC%89%E8%BF%9E)
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