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一個邊為5,他可為腰,也可為底.當它為腰時,因為是等腰三角形,所以另兩邊為腰5和底邊20-5-5=10.但根據三角形的任意兩邊之和大於第三邊,而5+5=10,所以不行,而當5為底,另兩腰為(20-5)/2= 7.5和7.5.而7.5+5大於7.5,7.5+7…
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