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陰影部分的面積=三角形ABC的面積+三角形BCG的面積(G為BF與CE的交點)三角形ABC的面積=1/2正方形ABCD的面積=12cm²;三角形BCD中EF為中位線,所以EF平行於BC可證三角形BCG相似與三角形EFG,EF=1/2BC可求出:三角形B…
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