问题
填空题
设
为三维空间的两组不同的基，令β=β1+2β2-3β3，则β在基α1，α2，α3下的坐标为______．
答案
参考答案：-4，-2，2
解析：[详解] 由(β1，β2，β3)=(α1，α2，α3)Q，
可得Q=(α1，α2，α3)-1(β1，β2，β3)
[*]
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设
为三维空间的两组不同的基，令β=β1+2β2-3β3，则β在基α1，α2，α3下的坐标为______．
参考答案：-4，-2，2
解析：[详解] 由(β1，β2，β3)=(α1，α2，α3)Q，
可得Q=(α1，α2，α3)-1(β1，β2，β3)
[*]
| 用方框内所给词的适当形式填空。 | |
—To money for the patient. 2. She doesn't have any . But she likes studying very much. 3. Let's go and on the ice. 4. —Would you like to buy two of shoes for us? —Yes,I'd love to. 5. It's a fine day today. Many children are flying on the playground. 6. —What do you like doing in your free time? — stamps. 7. Mrs Wang has been since ten o'clock. |