在等差数列中，，则的值为（） A．2 B．3 C．4

在等差数列中，，则的值为（）

A．2 B．3 C．4 D．5

答案

【解析】在等差数列中，因为，所以，所以=2.

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在等差数列中，，则的值为（ ） A．2 B．3 C．4

答案

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在等差数列中，，则的值为（） A．2 B．3 C．4