2013 National Question 5 Single-choice Differentiating 2013_daganji_old 5.(5分)(x+2)<sup>8</sup>的展开式中x<sup>6</sup>的系数是( ) A. 28B. 56C. 112D. 224 Answer keyC ☆ SaveCan't do it, show the explanation查看原卷 →