數學知識交流---(4)江苏2011
回答 (1)
2011-07-06 3:02 am
✔ 最佳答案
Since sum of even functions is even, so for f(x) to be even, both x^2 and |x + a| must be even. For |x + a| to be even ( symmetrical about the y - axis), a = 0.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110705000051KK00766