请对以下各题给解,请说明原因理由.易懂!麻烦注明题号. 1.在凸四边形ABCD中AB=2,BC=4,CD=7,若AD=x,则x的取值范围是( )(A)1<x<13 (B)2<x<7 (C)2<x<13 (D)1<x<7
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![请对以下各题给解,请说明原因理由.易懂!麻烦注明题号. 1.在凸四边形ABCD中AB=2,BC=4,CD=7,若AD=x,则x的取值范围是( )(A)1<x<13 (B)2<x<7 (C)2<x<13 (D)1<x<7](/uploads/image/z/697752-0-2.jpg?t=%E8%AF%B7%E5%AF%B9%E4%BB%A5%E4%B8%8B%E5%90%84%E9%A2%98%E7%BB%99%E8%A7%A3%2C%E8%AF%B7%E8%AF%B4%E6%98%8E%E5%8E%9F%E5%9B%A0%E7%90%86%E7%94%B1.%E6%98%93%E6%87%82%21%E9%BA%BB%E7%83%A6%E6%B3%A8%E6%98%8E%E9%A2%98%E5%8F%B7.%26%23160%3B1.%E5%9C%A8%E5%87%B8%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%ADAB%EF%BC%9D2%2CBC%EF%BC%9D4%2CCD%3D7%2C%E8%8B%A5AD%EF%BC%9Dx%2C%E5%88%99x%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%28%26%23160%3B+%29%28A%EF%BC%891%EF%BC%9Cx%EF%BC%9C13%26%23160%3B%EF%BC%88B%EF%BC%892%EF%BC%9Cx%EF%BC%9C7%26%23160%3B%EF%BC%88C%EF%BC%892%EF%BC%9Cx%EF%BC%9C13%26%23160%3B+%EF%BC%88D%EF%BC%891%EF%BC%9Cx%EF%BC%9C7%26%2316)
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