2024届滚动联考04数学.考卷答案

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2024届滚动联考04数学.考卷答案试卷答案

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Harryturnedandranfromthepond.ThemomentIcrashedthroughthekitchendoor,sobbing,mumrushedover.

分析利用分段函数,逐步求解函数值即可.

解答解:函数f(x)=$\left\{\begin{array}{l}{2{a}^{x},x≤1}\\{lo{g}_{a}({x}^{2}-1),x>1}\end{array}\right.$,
当f(2$\sqrt{2}$)=$lo{g}_{a}({(2\sqrt{2})}^{2}-1)$=1,解得a=7,
则f(f(2))=f($lo{g}_{7}({2}^{2}-1)$)=f(log73)=$2×{7}^{lo{g}_{7}3}$=6.
故答案为:6.

点评本题考查分段函数的应用,函数值的求法,考查计算能力.