(100-1000)/(1+x)+(450-1000)/(1+x)^2+(1050-1000)/(1+x)^3+(1900-1000)/(1+x)^4>0
    0≤（1-60/x）^2≤1
    10x+(x-3)<52
    -x^2+20x-50≥0
    15000+x－x×12%≥4500
    X(5X+2)<0
    x（5x+2）<0
    16m^2-4(m-1)(4m-2)>0
    m^2-m+1>0
    m^2-m-1>0
    x-2>1 2(x-1)
    5x-3<4x 4(x-1)+3>2x
    2x+3>1 8-2x
    2x+1>x-5 4x<3x+2
    5-0.5x-2>=x
    2x-7<3x-3
    x-45大于等于15-6x+6
    3x+4>x 5x-5<4x-2
    x-3<0 2(x+1)>x+3
    (x-3)/4-(4x-3)/2<6

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