1/x>100
    1/x>1
    1/x>10000000
    x^2>0
    2a+12(2000-a)<=10000
    70x+50(30-x)≤1600
    2(2x-1)≥(3x-4)
    3+2X<4+3X 3-5X>3X-5 7+X<4X-2
    3X-5>-2X-1
    3X-5>2X+1
    1<-3X-4<=6
    1<3x+4<=6
    0.8(y-20)+20>=80
    n/(2*n+2)>9/20
    n/(2*n+2)<9/20
    196x-x^2<600
    2-2X/x+1>0
    2-2x/x+1<0
    2-2x/x+1<10
    x^2+3x≥0

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