3x-1/x-5≤2
    x^2-2x-3＞0
    x2-2x-3＞0
    3+x＜4+2x 5x-3≤4x-1 7+2x＞6+3x
    3+2x≤4+3x 7x-4＜6x-2 7+3x＞4+4x
    a^2+3a>0
    2(x+2)-6≤-3(x-4)
    (4-8x)/5≥0 7(1-2x)>10-5(4x-3) x/3+1<-x-(x+10)/2
    1/3x+(2x-5)<4 3(2x-3)≥2(x-4)
    2x-10≥0
    70*2800^n>2801^n
    324t^2-4(2t-9)(90t-t^2)≥0
    x+3/2≥1
    x/8<1
    x-2（x-1）≥1 2+6x＞2x-4
    x-2（x-1）≥1 2+6x＞2x-2
    x*ln(x)=1000000
    x*lg(x)=1000000
    x*lg(x)>1000000
    x*lg(x)<1000000

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