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已知函数f(x)=3x+x-9的零点为x,则x所在区间为( ) A.[-,-] ...
已知函数f(x)=3
x+x-9的零点为x
,则x
所在区间为( )
A.[-
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,-
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]
B.[-
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,
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]
C.[
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,
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]
D.[
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,
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]
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