题目
题型:北京难度:来源:
a |
b |
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答案
a |
b |
∵
b |
a |
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∴
b |
a |
b |
即(1,1)•(2+λ,4+λ)=2+λ+4+λ=6+2λ=0,
∴λ=-3.
故答案:-3
核心考点
举一反三
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A.
| B.
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AG |
GD |
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a |
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a |
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b |
a |
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AD |
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λ |
μ |
AB |
a |
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b |
BD |
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A.
| B.
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| D.
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AG |
GD |