数学very good~急

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数学very good~急
如图所示,C是线段上一点,点D,E分别是AC,CB的中点,若AB=17cm,求线段DE的长

897231460,
∵点D,E分别是AC,CB的中点
∴DC＝1/2AC,CE＝1/2CB
∵DE＝DC＋CE＝1/2AC＋1/2CB＝1/2AB
∴DE＝1/2×17＝17/2厘米

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