2ãç´æ¥ä»£å
¥ = 0
4ãçº¦å» x 代å
¥ = 1/2
6ã= 2-0-0 = 2
8ãä¸ä¸åé¤ä»¥ x^4 å¾ 0/1 = 0
10ã=ï¼1+0ï¼ï¼2-0ï¼= 2
12ãçå·®æ±åï¼ä¸ä¸é¤ä»¥ n^2 = 1/2*n(n-1)/n^2 = 1/2
14ãéåï¼çº¦å» 1-xï¼å¾ (x-1)(x+2) / [(1-x)(1+x+x^2)] = -(x+2)/(1+x+x^2) = -1
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