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已知函数y=x3-3x+c的图象与x轴恰有两个公共点,则c=( ) A.-2或2...
已知函数y=x3-3x+c的图象与x轴恰有两个公共点,则c=( )
A.-2或2
B.-9或3
C.-1或1
D.-3或1
考点分析:
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