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如圖,(1)當點C在線段AB上時,∴CD=12(AB−BC)=12(60−20)=12×40=20(cm);(2)當點C在線段AB的延長線上時,∴CD=12(AB+BC)=12(60+20)=12×80=40(cm);∴CD的長為20cm或40cm.
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