论文部分内容阅读
题若(1+x+x2)1000的展开式为a0十a(1-x)+a(2-x2)+…+a2000x2000,则a0+a3+a6+a9+…+a1998的值为( ) (A)3333. (B)3666. (C)3999. (D)32001. (2001年高中联赛) 这是一道源于教材而高于教材的好题.认真观察条件以及所求式子的特点,恰当地利用w(w+1/2±
If the expansion of the question (1+x+x2)1000 is a0 a(1-x)+a(2-x2)+...+a2000x2000, then the value of a0+a3+a6+a9+...+a1998 is () (A)3333. (B)3666. (C)3999. (D)32001. (Senior High School League 2001) This is a good question that stems from the teaching material and is higher than the teaching material. Carefully observe the conditions and the characteristics of the style , use w(w+1/2±) appropriately