已知函数f(x)=x
2,g(x)为一次函数,且一次项系数大于零,若f(g(x))=4x
2-20x+25,求g(x)的表达式.
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已知函数
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.
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计算:(1)
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(2)log
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+ln(
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)+log
2(log
216)
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已知全集为R,集合A={x||x-1|<4},集合B={x|x
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R(A∩B∩C).
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已知函数f(x)=4x
2-kx-8在区间[5,20]上有单调性,求参数k的取值范围.
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若f(x)是奇函数,g(x)是偶函数,且f(x)+g(x)=
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,则f(x)=
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