顯然非等差數(shù)列-閱讀頁(yè)
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【正文】 nnknk6)12)(1( )3(12 ?????nnnknk。Ch21 Sequences and Summations ※ Sequence (數(shù)列 ) Def 1. A sequence is a function f from A ? Z+ (or A ? N) to a set S. We use an to denote f(n), and call an a term (項(xiàng) ) of the sequence. Example 1. {an} , where an = 1/n , n ? Z+ ? a1 =1, a2 =1/2 , a3 =1/3, … Example 2. {bn} , where bn= (1)n, n ? N ? b0 = 1, b1 = 1 , b2 = 1, … Examples to find a simple formula for {an} 1) a1=1, 189。,
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