lnx>2
    32000+6.2*a-168000-3.5*a>0
    32000+6.2*x-168000-3.5*x>0
    653*X+35760＜3192*X
    x^2-5x+6<0
    x^2>1
    x+3（x-2）≤4
    x<=2/3(150-x); 100*x+120(150-x)<=17000
    2x(1.15+x)/(1+0.7x)/(2.15x+1.15)>1
    (x+1)/(x-2)>1
    5x≤2x+18
    100*120+(150-m)(300-120)≥31800
    8000+220(150-m)≥31800
    26700 + X - ( 10 % / 4 ) * X ≥50000
    26700+X-(10%/4)X≥ 50000
    26700+X-(10%14)X≥ 50000
    8138+153.92*X＜751.71*X
    -lnx/x²＞0
    2.5 <-4.256x^3+181.748x^2-2663.508x+15354.783 <3584.345
    2.5 <-4.256x^3+181.748x^2-2663.508x+15354.783 <5522.2792

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