湘教版高中数学必修244向量的分解与坐标表示内容摘要:
2i3j=(2,3) 已知 , 你能得出 , , 的坐标吗。 1 1 a=(x ,y ) 2 2 b=(x ,y ) a+b a b λ a → → → → → → → 已知, a=(x1,y1),b=(x2,y2),则 a+b=(x1i+y1j)+(x2i+y2j) =(x1+x2)i+(y1+y2)j 即 a+b=(x1+x2,y1+y2) 同理可得 ab=(x1x2,y1y2) 这就是说,两个向量和与差的坐标分别等 于这两个向量相应坐标的和与差。 结论: 一个向量的坐标等于表示此向量的有向线段的终点的坐标减去始点的坐标。 y x O B(x2,y2) A(x1,y1) 如图,已知 A(x1,y1),B(x2,y2), 则 AB= OB OA = (x2,y2) (x。湘教版高中数学必修244向量的分解与坐标表示
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