x+5<2 x-5>100
    x＋2＜3x
    x＋2＞3x
    2x-3＜-5
    x * ( x + 1 ) <2000000000
    x*(x+1)<1000000
    x*(x+1)<=2000000000
    x*(x+1)/2<1000000000
    x*(x+1)/2<=1000000000
    x*(x+1)<1010
    x * (x + 1) / 2 <= 1000000000
    x < 3
    n(n+1)/2<=1000000000
    6x-30+2x>=75
    5x+1>3x-3
    (16k+4)(2k+1)(2k+2)-(4k+3)(16k+16)k>0
    e^(0.297+0.417x)/1+ e^(0.297+0.417x)>45/73
    e^(0.444+0.228x)/1+ e^(0.444+0.228x)>45/73
    e^(0.313+0.389x)/1+ e^(0.313+0.389x)>45/73
    e^(0.297+0.417x)/1+ e^(0.297+0.417x)>45/73

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