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因為EF//BC 所以△AEF∽△ABC 所以S△AEF/S△ABC=EF^2/BC^2 因為△AEF的面積等於梯形EFBC的面積 所以S△AEF/S△ABC=1/2 所以EF^2/BC^2=1/2, 即EF^2/(2√2)^2=1/2 解得EF=2
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