1题12
设中垂线为DE,则AD=BD,所以BD+CD=AD+CD,即BC+AC=17,所以腰长12
2题为等腰三角形
(a+b-c)*(a-b)=0,就是说(a+b-c)等于0或(a-b)等于0,若a+b-c=0,则a+b=c不符合三角形两边之和大于第三遍,所以a-b=0,即a=b.
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