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1 “二项式定理”常见的题型1)求指数n ;2 )求二项式两项中的某一项 (或相关部分 ) ;3)求二项展开式的某一项 ;4 )求二项展开式的某些项的系数和 ;5 )求n个二项式的和、差、积的某项 ;6 )三项式问题 .2 例题研究例 1 x +14(x - 1) 5的展开式中 ,x4的系数为 ( )(A) - 4
1 The common questions of the “binomial theorem” 1) find the index n; 2) find one of the binomial terms (or related part); 3) find the binomial expansion of an item; 4) Find the coefficients of some terms of the binomial expansion; 5) Find an item of sum, difference, and product of n binomial terms; 6) Trinomial problem. 2 Example of the study case 1 x +14 (x - 1) In the expansion of 5, the coefficient of x4 is ()(A) - 4