题文
已知向量
,且

∥

,则

________. 题型:未知 难度:其他题型
答案
-5解析
因为

∥

,所以 2m=-4,解得m=-2,

(1,2)·(-2+1,-2)=-1-4=-5.
考点
据考高分专家说,试题“已知向量,且∥,则________......”主要考查你对 [向量数量积的含义及几何意义 ]考点的理解。
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