1≤|2x-1|<5 1≤|2x-1|<5当2x-1>0时,得1≤2x-1
5个回答
1≤|2x-1|<5
令2x-1=y,x=(y+1)/2
则有 1≤|y|<5
解得
-5
1<=y<5, 1<=x<3
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