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在三角形ABC中,D、E分別是AB、AC的中點,則三角形ADE與四邊形DEBC面積的比是(1:3) 三角形ADE相似於三角形ABC,相似比是:1:2 則三角形ADE的面積:三角形ABC的面積=1:4 即:三角形ADE面積:四邊形DEBC面積=1:(4-1)=1:3
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