问题
填空题
已知
|
答案
∵
=(1，3)，e1
=(1，1)e2
∴2
+λe1
=(2+λ，6+λ)e2
∵
=2e3
+λe1
(λ∈R)，e2
=(x，1)e3
∴
解得x=-3x=2+λ 1=6+λ
故答案为-3．
搜题请搜索小程序“爱下问搜题”
已知
|
∵
=(1，3)，e1
=(1，1)e2
∴2
+λe1
=(2+λ，6+λ)e2
∵
=2e3
+λe1
(λ∈R)，e2
=(x，1)e3
∴
解得x=-3x=2+λ 1=6+λ
故答案为-3．
| 选择适当的句子补全对话。 | |
| A: Excuse me. 1. ______? B: Sorry, I don't have one. A: So I must go to the shop near our school. B: I think the shop is closed at this time. A: 2. ______ ? B: It's Sunday. On Sunday the shop closes early. A; 3. ______? B: Look, it says "closed". A: Oh, dear! You're right. It is closed. 4. ______? B: 5. ______ It's open 24 hours. A: OK, Let's go.
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