(1/2)*(x-3)+(1/3)*(x+sqrt2)<(1/6)*(x-sqrt98)+3
    90x+210（30-x）＞3300
    2+0.7（x-1）*2＜1.6x
    2+1.4x＜1.6x
    3x+28-x>=43
    2+0.7x>0.8x
    1.5x+2(10-x)*0.8>=15.6
    0.25+2x<=8-x/4
    abs(4-x^2)>2
    200x+240(100-x)<=22500
    200x+240(100-x)>=22400
    x+2√x≥8
    5x<9
    （8-100x）(1+2x)≥0.78*8
    -x^2-2x+1<0
    x/1500-x/5100>0.1
    x/340-x/1500<0.1
    x/340-x/5100<0.1
    2-x-x^2＞0
    3.792663444/((1/8.889*x^0.6+0.00002)*1.2+0.000283)>4000

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