9,1,4,3,40,( )A.81 B.80 C.121 D.120

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9,1,4,3,40,( )A.81 B.80 C.121 D.120
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9,1,4,3,40,( )A.81 B.80 C.121 D.120
9,1,4,3,40,( )A.81 B.80 C.121 D.120

9,1,4,3,40,( )A.81 B.80 C.121 D.120
选D详解如下a(n)=(-2240a(n-3)+10893a(n-2)+3276a(n-1))/1279a(1)=9 a(2)=1 a(3)=4 a(4)=3 (-2240a(1)+10893a(2)+3276a(3))/1279a(5)=40 (-2240a(2)+10893a(3)+3276a(4))/1279a(6)=121 (-2240a(3)+10893a(4)+3276a(5))/1279这是我在别的论坛看见的详解,觉得有些复杂
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