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1992年底世界人口达到54.8亿,若人口的年平均增长率为1%,经过x(x∈N*...
1992年底世界人口达到54.8亿,若人口的年平均增长率为1%,经过x(x∈N*)年后世界人口数为y(亿),则y与x的函数解析式为 .
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C.f(cos
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D.f(cos2)>f(sin2)
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若θ是三角形的内角,且函数y=x
2•cosθ-4x•sinθ+6,对于任意实数x,y均取正值,那么θ的取值范围是( )
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C.
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D.
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给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y),
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有下列四种变换方式:
①向左平移
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,再将横坐标变为原来的
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②横坐标变为原来的
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,再向左平移
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③横坐标变为原来的
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,再向左平移
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④向左平移
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其中能将正弦曲线y=sinx的图象变为
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