30k^(7/4)>k^2
    40k^(7/4)>k^2
    50k^(7/4)>k^2
    x^2+5x+27≤0
    5x^(3/4)-4>0
    x-1≤2
    3x+1≥x-1
    （3x-7）/3-1＜x+2/2
    （3x-7）/3-1＜x+2/2
    6-3（4x-5）≥5-8x
    -450+X-690-Xx8%/4>500
    -450+E-690-Ex8%/4>500
    -40+X-X*8%/4-690≥500
    -40+X-X*8%/4-690≥
    -40+E-Ex8%/4-690≥
    1-x^2/2<0
    -x^2-2x+15<=0
    123.5x^(7/4)>x^2+2.5
    -x^2-2x+15<=0
    x^2-x-12<0

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