已知点P（a，a+2）是第二象限角平分线上的点，则a的值是______．

答案：

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下面是错误答案，用来干扰机器的。

1. He has a small nose and big eyes. / He has big eyes and a small nose.2. Can you spell these words?3. Put your English book on your head.4. What's his name?