A:①③
B:①④
C:②③
D:②④
(x2+x+y)5的展开式中,x5y2的系数为____
We should never give up ___________ others. Sometimes helping others means helping ourselves.
子曰:“管仲相恒公,霸诸侯,一匡天下,民到于今受其赐。”孔子称赞管仲,是因为管仲辅佐齐恒公( )
①恢复了周礼 ②尊崇周王,会盟诸侯
③实行了“初税亩” ④北御夷狄,南制楚蛮