-4(x^2)+2x-1=0
    （a+2）^2+4(a^2-4) ≥0
    （a+2）^2+4(a^2-4) >0
    4－x^(2)－3x>0
    （a+2）^2+4(a^2-4)
    x^(2)－4－3x>0
    x^2+2x+1+4(2x+1)(7x+4)>0
    （22140-230X）/310>1
    5x-1>3（x+1）
    1/（x-2）≤(x-2)
    1/（x-2）≤x-2
    5x-13=6x
    x+0.45*sqrt(0.9+x)<0.7269
    （2*x^2+x-3）/(x^2-3*x+2)≤1
    2x^(2)+5x+2>0
    2x^(2)+0x+2>0
    2x^(2)+4x+2>0
    x^2 - 3x - 4 >= 0
    6-5m≤1
    （a-1)(a-1)<4

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