当X=0,A,X时函数Y的值
在函数y=f(x),x∈R中,f(0),f(a),f(x)各表示什么含义,
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已知函数f(x)定义在R上,对∀x,y∈R,有f(x+y)+f(x-y)=2f(x)•f(y),且f(0)≠0.
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已知函数f(x)满足f(x+y)+f(x-y)=2f(x)•f(y) (x∈R,y∈R),且f(0)≠0,试证明f(x
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已知函数f(x)满足f(x+y)+f(x-y)=2f(x)•f(y) (x∈R,y∈R),且f(0)≠0,试证明f(x
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函数y=f(x)中f代表什么含义
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