2^（x-1)≤26≤2^x
    5-2x ≤-3
    5-2x≥3
    3x-1<2
    2x+1<-3
    3x-1≥-3
    5x+3>2
    2^n>=2n^3
    3x+9≥12
    3x-9≤12
    5x-10≥0
    5x-10≥10
    4x-8≥0
    -3≥5-2x≥3
    -35-2x≥3
    5-2x≥3
    3x-1≤-3
    3x-1≥3
    4x-8≥0
    4x-8≥0

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