（x-1）×（x+2）^2×（x+3）≤0
    （x+4）×（x+2）×（x+3）≤0
    －3x∧2＋5x-2≧0
    6≤a+sqrt(a^2-16)
    x+15/2>=x+3
    sqrt(2x+14)>x+3
    3abs(x+1)>=x+5
    2x-4>x^2-x-3
    (x+20-158)/(x+20)>3/158
    (x+20-158)/158<3/158
    x-138/x+20<3/155
    (x+20-158)/(x+20)<3/155
    6*abs（3-4*x）-1/2>=1/4
    (x+20-158)/(x+20)>3/155
    3/155
    3/155
    6*abs（3-4*x）-1/4>=1/2
    （y－5）（y－3）≥2（y－3）＾2
    x^2-9＞0
    x^2+2x-8＞0

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