首页
已知函数y=的定义域为A.(-∞,1]B.(-∞,21]C.(-∞,-)∩(-,1]D.(...
试题详情
已知函数y=
的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-
)∩(-
,1]
D.(-∞,-
)∪(-
,1]
相关试题
-
已知函数y=的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-)∩(-,1]
D.(-∞,-)∪(-,1]
-
已知函数y=的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-)∩(-,1]
D.(-∞,-)∪(-,1]
-
已知函数y=的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-)∩(-,1]
D.(-∞,-)∪(-,1]
-
已知函数y=的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-)∩(-,1]
D.(-∞,-)∪(-,1]
-
已知函数y=的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-)∩(-,1]
D.(-∞,-)∪(-,1]
-
已知函数y=的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-)∩(-,1]
D.(-∞,-)∪(-,1]
-
已知函数y=的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-)∩(-,1]
D.(-∞,-)∪(-,1]
-
已知函数y=的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-)∩(-,1]
D.(-∞,-)∪(-,1]
-
已知函数y=的定义域为( )
A.(-∞,1]
B.(-∞,21]
C.(-∞,-)∩(-,1]
D.(-∞,-)∪(-,1]
-
已知定义域为R的函数f(x)是偶函数,当x≥0时,.
(1)求f(x)的解析式;
(2)证明方程f(x)=21-x在区间(1,2)上有解.