来自蒋邵岗的问题
已知函数f(x)满足:f(1)=14,4f(x)f(y)=f(x+y)+f(x-y)(x,y∈R),则f(2010)=()A.12B.13C.14D.1
已知函数f(x)满足:f(1)=14,4f(x)f(y)=f(x+y)+f(x-y)(x,y∈R),则f(2010)=()
A.12
B.13
C.14
D.1
1回答
2020-12-0304:07
已知函数f(x)满足:f(1)=14,4f(x)f(y)=f(x+y)+f(x-y)(x,y∈R),则f(2010)=()A.12B.13C.14D.1
已知函数f(x)满足:f(1)=14,4f(x)f(y)=f(x+y)+f(x-y)(x,y∈R),则f(2010)=()
A.12
B.13
C.14
D.1
解法一:∵4f(x)f(y)=f(x+y)+f(x-y)
取x=1,y=0得f(0)=12