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据《世界统计年鉴2000》记载1996年中国、美国、印度、澳大利亚四个国家的人口...
据《世界统计年鉴2000》记载1996年中国、美国、印度、澳大利亚四个国家的人口分别为122389,26519,94561,1831万人,则以上四国人口之比为 (精确到0.01).
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函数y=
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的自变量x的取值范围为
.
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在同一直角坐标系中,函数y=kx+k与y=
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(k≠0)的图象大致为( )
A.
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B.
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C.
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D.
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如图,PA为⊙O的切线,A为切点,PO交⊙O于点B,PA=8,OA=6,则tan∠APO的值为( )
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A.
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B.
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C.
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D.
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下列各式中,能表示y是x的函数关系式是( )
A.y=
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B.y=x
3C.y=
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D.y=±
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