八年级上数学题第二章,特殊三角形的第六节.典中点的题目.要有过程的.①如图,在△ABC中,CE是AB边上的中线,CD⊥AB于点D且AB=5,BC=4,AC=6,求DE的长②已知:如图,在在△ABC中,AB=AC,∠BAC=90°,D是BC上任

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