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
    π/1.5*0.14*（52*（2/sin18-5）+60x）＞238.386
    10-3(x+6)≤1
    x^2+x-6＞0
    -x+x^2-6＞0
    2lnx-x^2≤-1
    -x+x^2-6≥0
    x-x^2+6＜0

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