0.2*0.95^≤0.10
    60x+24(100-x)>=3120
    360x+324(100-x)>=3120
    360x+324(100-x)<=3120
    （3x+2）×（5x+3）^2×（3x-1）≤0
    （x^2-4）÷（x+4）≤0
    （x-1）×（x+5）^4×（x-3）≤0
    （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

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