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已知锐角三角形的边长是2,3,x,那么第三边x的取值范围是( ) A.1<x< ...
已知锐角三角形的边长是2,3,x,那么第三边x的取值范围是( )
A.1<x<
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B.
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C.
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D.
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和
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B.1-
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设关于x的方程ax
2+(a+2)x+9a=0,有两个不相等的实数根x
1、x
2,且x
1<1<x
2,那么实数a的取值范围是( )
A.
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C.
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D.
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抛物线y=ax
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A.
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≤a≤1
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≤a≤2
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≤a≤1
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≤a≤2
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D.
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