(4a+1)/6<-2
    （2*（t+1.5)+0.8*9)*(83.69+8.5*t)/(11.5+t)≥144
    4a+1/6>0
    （2*（t-1.5)+0.8*9)*(62.7+8.6*t)/(9+t)≥144
    (2*（t+1.5)+0.8*9)*(93.78+9.1*t)/(12+t)≥144
    (2*（t+1.5)+0.8*9)*(93.78+9.1*t)/(12+t)≥1.6
    3x＋2＞4
    (50+x)(600-5x)>=3300
    -3a+2>0
    168-x-x*10％/4×3≥30
     4x-3<6x+3 1.5x-1>5-0.5x
    4x-3<6x+3
    0.2x+0.4(50-x)＞16
    0.6x+0.9（50-x）≤40
    -11200+a-a*10%≥100
    2x+5<4x-2
    2x^2-3x-4≤0
    5(x-1)≤3(x+1)
    x×8-x≥30
    x×16-x÷2≥30

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