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证明:每个函数 f: R -> R 都可以写成一个偶函数和一个奇函数的和。(提示: f(x) = (f(x) + f(-x))/(2) + (f(x) - f(-x))/(2) 。)
证明:每个函数 f: R -> R 都可以写成一个偶函数和一个奇函数的和。(提示: f(x) = (f(x) + f(-x))/(2) + (f(x) - f(-x))/(2) 。)
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