问题 解答题 解不等式组:x+12x-1≥1log2(x2+x+2)≥2. 答案 x+12x-1≥1log2(x2+x+2)≥2⇒x-22x-1≤0x2+x-2≥0⇒12<x≤2x≥1或x≤-2⇒x∈[1,2].