x*x+2x-3>0
    (60－50)×a+(60×0.9－50)×(40－a)+(70－60)×40≥680
    600x+1000(200-x)<=180000
    x^2-3x+1>0
    x*(x+1)/2<=2*x+1
    x*(x-1)/2<=x
    x*x-3*x-2<=0
    x^2-1<0 x^2-3x<0
    (x-5)(3-2x)＞5
    -1/8*7+7x+4>3+61/12
    ex-3≤1
    3
    3>x^2
    2-5x>2*abs(x-3)
    3x+5
    5/(4-m)>0
    x^3+2x^2+1>4
    68-X-X×10%/4×3≥30
    （260x+40x×70%-12800）÷12800≥80%
    3x≥4x-1 5x-1>2x-4

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