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若等差数列{a
n}的首项为7、公差为-2,其前n项和S
n的最大值为S
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如图正六边形ABCDEF中,P是△CDE内(包括边界)的动点,设
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A.[3,4]
B.[3,5]
C.[2,4]
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设函数f(x)=sin(ωx+
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A.x=
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