(x*x-5*x+5)*(x*x-5*x+5)-1<=0
    3*x*x+9*x+8>=0
    20000*(300/(300+0.775x))>20000*(300/(300+x))*1.4
    300/(300+0.775x)>(300/(300+x))*1.4
    300/(300+0.775x)>300/(300+x)*1.4
    cosx>2
    -2＜-3/k-3≤-1
    （800-2x）（600-2x）≥240000
    （800-2Xx）（600-2x）≥240000
    x^2+4x≥0
    x^2+8x-4≥0
    2x^2 + 5x - 3 > 0
    3(x-1)≤5x＋1
    x／4-3／20＜x／5
    2x + 5 > 11
    4-4×（K-1）×3≥0
    80-2x+20≥50
    －3＜－m－1＜1
    12x^2 + 30x + 12 < 0
    (-0.25^(x-1))+3*(0.5^(x-1))-3*(0.75^(x-1))>0.9

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