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已知函数,则方程f(f(x))=f(x)有( )个实数根. A.6 B.5 C....
已知函数
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,则方程f(f(x))=f(x)有( )个实数根.
A.6
B.5
C.4
D.2
考点分析:
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,∃m,n∈[0,5](m<n),使f(x)在[m,n]上的值域为[m,n],则这样的实数对(m,n)共有( )
A.1个
B.2个
C.3个
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A.
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B.3
C.
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D.2
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