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△ABC的内角A、B、C的对边分别是a、b、c,若B=2A,a=1,b=,则c=...
△ABC的内角A、B、C的对边分别是a、b、c,若B=2A,a=1,b=
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,则c=( )
A.
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B.2
C.
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D.1
考点分析:
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C.0.8,0.2
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函数f(x)=
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的定义域为( )
A.(-3,0]
B.(-3,1]
C.(-∞,-3)∪(-3.0)
D.(-∞,-3)∪(-3,1)
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A.4
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,8
B.
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已知函数f(x)为奇函数,且当x>0时,f(x)=x
2+
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,则f(-1)=( )
A.2
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已知集合A、B全集U={1、2、3、4},且∁
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A.{3}
B.{4}
C.{3,4}
D.∅
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