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命题1 已知函数y=f(x),x∈R,给出如下三个论断: ①f(x)是奇函数; ②f(x)的图像关于点(a,0)(a≠0)对称; ③f(x)是以2a(a≠0)为周期的周期函数.
Proposition 1 The known function y=f(x),x∈R, gives the following three arguments: 1f(x) is an odd function; the image of 2f(x) is symmetrical about point (a,0)(a≠0) ; 3f(x) is a periodic function whose period is 2a(a≠0).