题文
若 | a | =" 2," | b | =" 5," | a +b | = 4，则| a-b |= 。 题型：未知 难度：其他题型答案
42解析
略考点
据考高分专家说，试题“若 | a | =" 2," | b |.....”主要考查你对 [向量数量积的含义及几何意义 ]考点的理解。
题文
若 | a | =" 2," | b | =" 5," | a +b | = 4，则| a-b |= 。 题型：未知 难度：其他题型答案
42解析
略考点
据考高分专家说，试题“若 | a | =" 2," | b |.....”主要考查你对 [向量数量积的含义及几何意义 ]考点的理解。名师互学网 版权所有 (c)2021-2022 ICP备案号：晋ICP备2021003244-6号
