设等差数列的前n项和为,若,,则当取最小值时,n等于 A．6

设等差数列的前n项和为,若,,则当取最小值时,n等于

A．6 B．7 C．8 D．9

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设等差数列的前n项和为,若,,则当取最小值时,n等于 A．6

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