如图24-22,已知△ABC中,AB=4,D在AB边上移动(不与A、B重合),DE平行于BC交AC于E,联结CD.设S△ABC=S,S△DEC=S1(1)当D为AB中点时,求S1:S的值(2)若AD=x,S1/S=y,求y关于x的函数关系式及自变量x的取值范围(3
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![如图24-22,已知△ABC中,AB=4,D在AB边上移动(不与A、B重合),DE平行于BC交AC于E,联结CD.设S△ABC=S,S△DEC=S1(1)当D为AB中点时,求S1:S的值(2)若AD=x,S1/S=y,求y关于x的函数关系式及自变量x的取值范围(3](/uploads/image/z/13875275-11-5.jpg?t=%E5%A6%82%E5%9B%BE24-22%2C%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E4%B8%AD%2CAB%3D4%2CD%E5%9C%A8AB%E8%BE%B9%E4%B8%8A%E7%A7%BB%E5%8A%A8%28%E4%B8%8D%E4%B8%8EA%E3%80%81B%E9%87%8D%E5%90%88%29%2CDE%E5%B9%B3%E8%A1%8C%E4%BA%8EBC%E4%BA%A4AC%E4%BA%8EE%2C%E8%81%94%E7%BB%93CD.%E8%AE%BES%E2%96%B3ABC%3DS%2CS%E2%96%B3DEC%3DS1%EF%BC%881%EF%BC%89%E5%BD%93D%E4%B8%BAAB%E4%B8%AD%E7%82%B9%E6%97%B6%2C%E6%B1%82S1%3AS%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E8%8B%A5AD%3Dx%2CS1%2FS%3Dy%2C%E6%B1%82y%E5%85%B3%E4%BA%8Ex%E7%9A%84%E5%87%BD%E6%95%B0%E5%85%B3%E7%B3%BB%E5%BC%8F%E5%8F%8A%E8%87%AA%E5%8F%98%E9%87%8Fx%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%883)
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