k^2-k+4 <1 2+3k-k^2<1
    3x+2>4x-2
    3x+3≤5x+7
    （x+3)^2+8x+8<0
    2x-5>x+1
    （2+x）＞0
    （2+x）*（1+x）＞0
    （6x-13）/2≥-14
    6x-13/2≥-14
     3*x+6>4*x+5 x-5/2>=3/2*x-5
    20-3y≥0
    2-(x-1)/4>=(2x+3)/6
    2x>-3
    -7-2x<0
    4x-20>7x-28
    5x+4>3x+1
    4x-8-2x-5>=-28
    4y^2-2*2y*16+16^2-4*（3*32-3y^2）≥0
    4x-3＜x^2
    5*(3-2x)>0

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