.(3x-y)(x+2y)5的展开式中,x4y2的系数为( )A.110 ... 问题详情:.(3x-y)(x+2y)5的展开式中,x4y2的系数为()A.110 B.120 C.130 D.150【回答】.A解析因为(x+2y)5...