问题
选择题
函数f(x)=
|
答案
∵函数f(x)=
,lo
(x≥5)g x2 f(x+
)(x<5)7 2
∴f(1)=f(1+
)=f(7 2
)9 2
=f(
+9 2
)=f(8)7 2
=log28
=3.
故选D.
函数f(x)=
|
∵函数f(x)=
,lo
(x≥5)g x2 f(x+
)(x<5)7 2
∴f(1)=f(1+
)=f(7 2
)9 2
=f(
+9 2
)=f(8)7 2
=log28
=3.
故选D.