| 向量与数的乘法 |
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| 引用本文： | 乔南.向量与数的乘法[J].中学数学教学参考,2008(11). |
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| 作者姓名： | 乔南 |
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| 摘 要： | Vectors may also be multiplied by a number. The productof the vector a by the number λ is defined as the vector a λ=λa, the absolute value of which is obtained by multiplying theabsolute value of the vector a by the absolute value of thenumber λ, i. e. |λa|=|λ||a|, the direction coinciding withthe direction of the vector a or being in the opposite sensedepending on whether λ>0 or λ<0. If λ=0 or a=0, then λ a
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| 关 键 词： | 结合律 向量 分配律 方向 绝对值 乘法 |
Multiplication of a Vector by a Number |
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