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函数y=-abx+bc(c与a、b不同号)的图象不通过( ) A.第一象限 B....
函数y=-abx+bc(c与a、b不同号)的图象不通过( )
A.第一象限
B.第二象限
C.第三象限
D.第四象限
考点分析:
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如果a>0,
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,则
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-
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的值是( )
A.-3
B.3
C.2a+2b+3
D.-2a+2b-5
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在半径等于5cm的圆内有长为5
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cm的弦,则此弦所对的圆周角为( )
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C.60°
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把含盐15%的盐水a千克与含盐20%的盐水b千克混合得到的盐水的浓度是( )
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B.
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C.
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D.
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当锐角α>30°时,则cosα的值是( )
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B.小于
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C.大于
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D.小于
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已知直线y=kx+b过点(0,1)和(2,0),则( )
A.k=
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B.k=
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C.k=-
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,b=1
D.k=-
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,b=1
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