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f(x1)+f(x2)=2f((x1+x1)/2)f((x1-x2)/2)恒成立,求证f(x)是偶函数
f(x)恒不为0
人气:286 ℃ 时间:2020-10-01 14:34:28
解答
令x₂=x₁2f(x₁) = 2 f(x₁) f(0)令x₂= -x₁f(x₁) +f(-x₁) = 2 f(0) f(x₁) 故 2f(x₁) = f(x₁) + f(-x₁)即 f(-x₁) = f(x₁)∴f(x)...
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