题文
已知
________. 题型:未知 难度:其他题型
答案

解析
∵

∴

由此可得

∴

故答案为:

考点
据考高分专家说,试题“已知________......”主要考查你对 [向量数量积的含义及几何意义 ]考点的理解。
上一篇 I lived in Dallas, Texas nearly all my life with my mom, dad and older sister. W
下一篇 Last Tuesday I took my two daughters, aged five and seven, to town by car. It be