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もしX>2、2X-1+X+2=X+1、X=0(捨去)もし1/2≤X≤2、恒成立若-1<X<1/2、なら1-2X+2-X=X+1、X=1/2(捨去)若X≤-1、2X+2-X=-X1、X(捨去)だから答えは1/2≤x≤2多くの時間を費やして、私のベストを選んで質問:問題は難しい? 頭を鍛えて...
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