若数项级数(an+an+1一an+2)收敛于( ).

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问题 若数项级数(an+an+1一an+2)收敛于(    ).

选项 A、S+a1
B、S+a2
C、S+a1一a2
D、S+a2一a1

答案B

解析
=S+(S—a1)一(S—a1—a2)
=S+a2
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