x^2+x+2>0
    1800-30y+48y<=2500
    3213.49×10^3≦18.4×10^6×[0.18x(1.13-0.5x)+(1.5-0.18)×0.2×(1.13－0.1)]
    12x-4≥x-3
    ［x－3］≥4
    2（x-3）+7＞11
    1-e^(-(5000-k)*0.85^k*0.15-0.85^k)>0.99
    2*(x-2)<3*(x-1) x/2-(x-1)/4<1
    x*(x-2)<3*(x-1) x/2-(x-1)/4<1
    2*(3-y)<4-3（y-1)
    a+1<10
    3+x>9
    3（x+1）小于5x-2
    1/2x-7小于或等于1-3/2x
    100-x≤1.7x
    n∧2+59n-2400≦0
    -6/4+m<0
    3x－5＞x
    －3x＋5≥16
    x－5＞－8

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