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Urgent! ! ! Xicheng district senior high school mathematics compulsory five unit examination questions: series of answers
Unit test two series
1-8CDBADBAC
9 13
10 3
1 1 15
12 16; 255
13 -9
14 145
15 n(n-9) or -n(n-9)
16 8/3[ 1-(- 1/2)^n]
17 8 10 12 or 17 10 3.
18 n(2n+ 1)
19 b 1=3, geometric series with common ratio of 2.