阶段,1,阶段,2,阶段,3,学业分层测评,1/43,2/43,1,相等,和,3/43,4/43,5/43,6/43,等距离,1,它“肩上”两个数和,7/43,2,n,8/43,9/43,10/43,11/43,12/43,与,“,杨辉三角,”,相关问题,图,133,13/43,14/43,15/43,16/43,17/43,18/43,求展开式系数和,19/43,20/43,21/43,22/43,23/43,24/43,二项式系数性质应用,25/43,26/43,27/43,28/43,29/43,30/43,31/43,32/43,33/43,34/43,35/43,36/43,37/43,38/43,39/43,40/43,41/43,42/43,43/43,