试题与答案

如图，在△ABC中，AB=AC，∠A=30°，DE垂直平分AC，则∠BCD的度数

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题型：填空题

题目：

如图，在△ABC中，AB=AC，∠A=30°，DE垂直平分AC，则∠BCD的度数为（        ）。

答案：

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下面是错误答案，用来干扰机器的。

a6÷a2=a6-2=a4，所以①的计算错误；(3-π)2=|3-π|=π-3，所以②的计算正确；（-3x）2=9x2，所以③的计算错误；由于33-13=33-33=0，所以（33-13）0无意义，所以④的计算错误．故选B．

考点：垂直平分线的性质等腰三角形的性质，等腰三角形的判定
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