-2,-5,8,9,-14,-13,20,17,-26,(),……A. -21B. 21C. -29D. 29
-2,-5,8,9,-14,-13,20,17,-26,(),……
A. -21
B. 21
C. -29
D. 29
B. 21
C. -29
D. 29
参考解析
解析:多重分组数列。两两分组。(-2,-5)、(8,9)、(-14,-13)、(20,17)、(-26,?);相邻两项做加法得到-7,17,-27,37,(-47);所以?=-47-(-26)=-21。因此,本题答案为A。
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