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“x>1”是“|x|>1”的( ) A.充分不必要条件 B.必要不充分条件 C....
“x>1”是“|x|>1”的( )
A.充分不必要条件
B.必要不充分条件
C.充分必要条件
D.既不充分又不必要条件
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=( )
A.2-i
B.1-2i
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sin(-1920°)的值为( )
A.
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B.
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C.
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D.
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定义在R上的函数f(x)=ax
3+bx
2+cx+3同时满足以下条件:
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(Ⅰ)求函数y=f(x)的解析式;
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已知函数
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,求
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的取值范围.
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