chenjiajin8165
春芽
共回答了13个问题采纳率:100% 举报
依题意可得:AB = AC ,AE = CE ,2AB+BC = 21cm .
分两种情况讨论:
① 若 AB+AE = 12cm ,BC+CE = 9cm ,
则 AB-BC = 3cm ,而且,2AB+BC = 21cm ,
可得:AB = AC = 8cm ,BC = 5cm ;
② 若 AB+AE = 9cm ,BC+CE = 12cm ,
则 BC-AB = 3cm ,而且,2AB+BC = 21cm ,
可得:AB = AC = 6cm ,BC = 9cm .
1年前
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