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分析:D為線段AC的中點,線段AD與線段CD均為線段AC的一半,結果為2.5; 因為BC=AB-AC=9-5=4,且E為線段CB的中點, 所以線段CE為線段CB的一半,結果為2, 所以線段DE的長為線段CD與線段CE的和,結果為4.5
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