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已知函数f(x)=ax-1+1(其中a>0,a≠1)的图象恒过定点A,则点A的坐...
已知函数f(x)=ax-1+1(其中a>0,a≠1)的图象恒过定点A,则点A的坐标为 .
考点分析:
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如图,有一直角墙角,两边的长度足够长,在P处有一棵树与两墙的距离分别是a m(0<a<12)、4m,不考虑树的粗细.现在想用16m长的篱笆,借助墙角围成一个矩形的花圃ABCD.设此矩形花圃的最大面积为S,若将这棵树围在花圃内,则函数S=f(a)(单位m
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A.
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B.
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C.
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D.
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函数
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是R上的减函数,则a的取值范围是( )
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B.
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C.
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D.
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,则a,b,c的大小关系是( )
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