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(1)若3cm為腰長,7cm為底邊長,由於3+3<7,則三角形不存在;(2)若7cm為腰長,則符合三角形的兩邊之和大於第三邊.所以這個三角形的周長為7+7+3=17(cm).答:這個三角形的周長是17cm.故答案為:17cm.
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