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對於這類題目最好的方法是畫圖解决,根據題意可知C、D兩點只能位於AB內而不在是在AB外.設AB長為Xcm,則CD為1/4X cm AC+BD=3/4X cm,又因為M、N分別是AC和DB的中點,所以MC+DN=1/2(AC+BD)=3/8X cm,因為MN =10cm,所以MN=CD…
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