0.03x≥-0.18
    2-x<-1
    x+1≤-2
    300x>1400
    -1/3x<=2/3-x
    -(1/3)x≤9
    (0.4x+0.9)÷0.5-(0.02+0.02x)÷0.03＞(x-5)÷2
    -4x≤-16
    30x+48（60-x）≤2500
    72x－2x^2≥550
    （2*x+7.2+0.8*9.5）*(7.2*x+120.98)/100/(13.6+x)>1.6
    （2*x+9.1+0.8*9.5）*(7.2*x+129.5)/100/(14.5+x)>1.6
    （2*x+8.6+0.8*9.5）*(7.2*x+128.48)/100/(14.3+x)>1.6
    （2*x+10+0.8*9.5）*(7.2*x+134.54)/100/(15+x)>1.6
    （k－1）×（k－√3）×（k＋√3）＞0
    （2*x-4.8+0.8*9.5）*(9.1*x+67.2)/100/(7.6+x)>1.6
    2x/3<-1
    (2a+5-12)/3>-16a/3
    2a-1/2a>1/e
    3x-1/4大于7x-2/6

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