-（2a-1）^2-4（a-2）（a+0.5）≥0
    1.05^x-5.5%x>0
    -450 + e -690 - e * 8 % / 4 ≥500
    -450+E-690-E*8%/4≥500
    5000-5000(1-X)^3>3*5000*X
    x*x*x*x<8*x*x+9
    －2x＞-5
    2-3x<0
    abs(x+1)+abs(x+3)+abs(x+5)>5
    log(x-2,x^2-8x+15)>0
    sqrt(x^2-3*x-10)>x-2
    abs(x^2-5*x+4)
    log(a,1/2)<1
    sqrt(4*x-3)-x<0
    1+x-x^2>0
    1+x-x2>0
    2*x^2-3*x+4>0
    x^2-3x+1≤0
    2k-2>0
    (2+3k)^2-4(2k-2)>0

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