Note:Figure not drawn to scale.On line segment AD shown, $$AB=\frac1 2CD$$ and BC = 10. If AD = 100, then CD =
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数学PS
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Note:Figure not drawn to scale.On line segment AD shown, $$AB=\frac1 2CD$$ and BC = 10. If AD = 100, then CD =
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正确答案: E