作业帮数学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
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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
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
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
∵点D, E分别是AC,CB的中点
∴AD=DC，CE=EB
又∵AD+DC+CE+EB=AB
∵AB=17cm
∴DC+CE=DE
∴AD+EB=DE
所以DE=17/2=8.5cm
de=dc+ce; 因为dc=ad,ce=eb，所以 dc+ce=ad+eb
即 de=ad+eb （ab分为相等的两部分de和ad+eb ）
所以 de=0.5*17=8.5cm
小朋友，遇到问题要先思考啊
AB=AC+CB=2DC+2CE=2(DC+CE)=2DE=17CM
所以DE=17/2=8.5CM
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
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