# www.ag628.com：2019【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.ppt

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2.4.2 平面向量

（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

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