m、n∈R,a、b、c是共起点的向量,a、b不共线,c=ma+nb,则a、b、c 发布时间:2017-04-15 22:55 │ 来源:www.tikuol.com 题型:选择题 问题: m、n∈R,a、b、c是共起点的向量,a、b不共线,c=ma+nb,则a、b、c的终点共线的充分必要条件是( )A.m+n=-1B.m+n=0C.m-n=1D.m+n=1
题型:选择题 ---Would you like _______milk? ---No, _______.A.any; I wouldn't B.some, thanksC.any; thanks D.some; I don't 查看答案