Mathematics
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過程がわからないので教えてください

(5)2つの集合A={x[4≦x<9, xは実数}, B={x|1<x<5,xは実数} について, 2a+1 ∈ AUB を満たす実数 αの範囲を求めよ。 0<a≤4
数学1a 数学

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