x＞1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9＞x
    -2*k∧3+k∧2-k+1＜0
    0.018（31x-350）（31x-350）>(10+x)(56-x)
    6÷2×100%≥20%
    2x÷6x×100%≥20%
    6x－4÷6x×100%≥20%
    2÷6x×100%≥20%
    -4X>3
    2/3X>50
    5x-3>x+1
    x-3≤x-1÷3
    x-3≥x-1÷3
    1-2x>x-3/2
    x＞2x
    1-0.5a-2.5＞a-1
    x/ln((x+5474.3)-3.8)<28571
    x2大于等于36
    0.9x+40 > 0.95x+15
    10x-5(16-x)≥100
    (5x+2)(2-4x)(2-3x)<0

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