x+4<4
    2(2x-1)>5(x+1)
    1+2x>3(x-1)
    (x-3)/2>=x-2
    x-42≥312-3x＞6
    0.5*100*1.9+0.50*x*2.02-100-x>0 0.51*100*1.9+0.49*x*2.02-100-x>0 0.52*100*1.9+0.48*x*2.02-100-x>0 0.53*100*1.9+0.47*x*2.02-100-x>0
    0.5*100*1.9+0.50*x*2.02-100-x>0 0.5*100*1.9+0.50*x*2.02-100-x>0 0.51*100*1.9+0.49*x*2.02-100-x>0 0.52*100*1.9+0.48*x*2.02-100-x>0 0.53*100*1.9+0.47*x*2.02-100-x>0 0.54*100*1.9+0.46*x*2.02-100-x>0 0.55*100*1.9+0.45*x*2.02-100-x>0
    0.5*100*1.9+0.50*x*2.02-100-x>0
    0.3*100*1.9+0.7*x*2.02-100-x>0 0.4*100*1.9+0.6*x*2.02-100-x>0 0.5*100*1.9+0.5*x*2.02-100-x>0 0.6*100*1.9+0.4*x*2.02-100-x>0
    0.3*100*1.9+0.7*x*2.02-100-x>0
    0.8*100*1.9+0.2*x*2.02-100-x>0
    100x>0
    (2x-1)/3-2 ≥(3x-2)/2
    2x-1/3-2≥3x-2/2
    2（2x-1)-6≥3（3x-2）
    x×2^x≤400
    10(200-a-a/3)+12a≤1880
    √（x-1）-√（2x-1）≥√（3x-2）
    3.14/1.5*0.14*(52*(2/sin18-5)+60x)＞238.386
    3.14/1.5*0.14*（52*（2/sin18-5）+60x）＞238.386

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