(54.77+x)÷31≥2.85
    3000*0.6^x≤300
    3000*0.6^x≤500
    3000*0.6^x≤100
    1-0.75x-0.2＞x
    1-0.75x＞0.8-x
    1-0.75x＞1-x-0.2
    1-0.75x＞1-x+0.2
    1-0.75x＞x
    1-0.75x＞x+0.2
    （x-1）/［（x-2）（x-3）］≥0
    (1-x)*0.75*1.2＞（1-x）
    （x-1）/（x-2）（x-3）≥0
    (1-x)*0.9＞1-x
    (1-x)*0.9＞x
    x^2-x-6＜0
    x2-x-6＜0
    x×x-x-2≤0
    8➗x∧2＜2
    8➗x2＜2

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