80x^2-75x-18>0
    -2000 + 500/(1+r) + 700/(1+r)^2 + 2000/(1+r)^3>-10000 + 8000/(1+r) + 2500/(1+r)^2 + 2000/(1+r)^3
    -2000+500/（1+r）+700/(1+r)^2+2000/(1+r)^3>-10000+8000/(1+r)+2500/(1+r)^2+2000/(1+r)^3
    -2000+500/(1+r)+700/(1+r)^2+2000/(1+r)^3＞-10000+8000/(1+r)+2500/(1+r)^2+2000/(1+r)^3
    x^2+11x-200>0
    4a≥16a^2-128a+196
    4a≥9a^2-72a+144
    4a≥9a^2-72a-144
    1+1/x大于0
    1÷2×x－ln（x＋1）＞0
    6x+8>7x+4
    x+6<8
    x^2-x-6<0
    x^2-x-6<6
    x/(x-2)>0
    30<6x+7<32
    －1≤2x－1≤1
    x+0.24x>100
    4(a-4)+2(2-3a)+30>0
    (3a-2)/(2a-8)<=1

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