f(x)=2是不是偶函数?
f(x)=2\u662f\u5076\u51fd\u6570\u5417?\u662f\u7684\u3002
\u5b9a\u4e49\u57dfR\uff0c\u5173\u4e8e\u539f\u70b9\u5bf9\u79f0\uff1bf(-x)=2=f(x)\uff0c\u6ee1\u8db3\u5076\u51fd\u6570\u5b9a\u4e49\uff0c\u662f\u5076\u51fd\u6570\u3002
\u5176\u5b9e\u4ece\u51fd\u6570\u56fe\u50cf\u4e5f\u5f88\u660e\u663e\u80fd\u770b\u51fa\u6765\uff0c\u51fd\u6570\u56fe\u50cf\u5173\u4e8ey\u8f74\u6210\u8f74\u5bf9\u79f0\u3002
\u662ff(x+2)=f(-x+2)
\u56e0\u4e3a\u5173\u4e8ey\u8f74\u5bf9\u79f0
\u6240\u4ee5\u5c31\u662f\u628ax\u6362\u6210-x\u5c31\u884c\u4e86
∴f(x)是偶函数
是
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