lili118:【高中数学必修一ppt课件】2.4.2 平面向量数量积的坐标表示、模、夹角

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2.4.2 平面向量
数量积的坐标表示、模、夹角

例1 已知a ? (?1,2 ? 3 ), b ? (1,1), 求a与b的夹角? .

例2 已知A(1,2),B(2,3),C(-2,5),
试判断?ABC的形状,并给出证明.

练习 (1)已知 a =(4,3),向量 b 是 垂直于 a 的单位向量,求 b .

(2)已知a ? 10, b ? (1,2),且a // b,求a的坐标.

3? (3)已知a ? (3,0), b ? (k ,5),且a与b的夹角为 , 4 求k的值.
(4)以原点和A(5,2)为两个顶点作等腰
直角三角形OAB,?B=90?,求点B的坐标.

小结:


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