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已知函数,若关于x的方程f(x2+2x)=a(a∈R)有六个不同的实根,则a的取...
已知函数
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,若关于x的方程f(x
2+2x)=a(a∈R)有六个不同的实根,则a的取值范围是( )
A.(2,8]
B.(2,9]
C.(8,9]
D.(8,9)
考点分析:
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