x^(2)－6x＋5<0
    3x^(2)＋20x－7<0
    （x－1）（x＋2）≥3
    x^(2)＋x－5≥0
    sqrt(x^(2) + 3x) ≥ 2x + 3
    3x^(2)-112x-201764=0
    -3x^(2)>20x-7
    6×x+7×x=220
    60a+80×（10-a）≥670
    60a+80×（10-a）≤670
    80a+100×（10-a）≤900
    x小于等于-1
    -x小于等于1
    -x大于等于1
    3-5x≥0
    0.6×(1+x)÷12×(1-6%）+x＝11%
    168-X-X×10%/4×3≥30
    n^2+n>=2000
    （x-0.5)(x+1)(x-1)<0
    -450+x-690-x*8％/4≥500

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