29x<5x^2+20
    20x^2-4<-16x
    -6<16x^2+28x
    10x^2+42<-44x
    0<-12x^2-27x-15
    20x^2-11x<42
    0<-20x^2-46x-24
    200 >100+10+100-40
    10x >5x+0.5*x+100-2x x=20
    2x+3-x≥4
    x(20-2x)≥42
    10x>5x+0.5*x+100-2x
    0<0.4*e^(-0.4*(x-1))-e^(x-1)<1
    5x-3≥7
    0.35y+50/1800-100y×0.25≤8
    0.35y+1800-100y/50×0.25≤8
    （x-4）÷（X+4）≥97%
    3x 12x≤7x+2
    x×x+x＜0
    (3000-6*(100+a))/sqrt((100+a)*16)＞2

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