-2000+500/1+x+700/(1+x)^2+2000/(1+x)^3>-10000+8000/1+x+2500/(1+x)^2+2000/(1+x)^3
    80x^2+85x-13>0
    80x^2+157x-13>0
    8000>300/(1+x)+1800/(1+x)^2
    80x^2+157x+59>0
    p*p-2*p<8
    p*p-3*p>0
    p*p-p>2
    80r^2+157r+59＞0
    -20*(1+a)^3+5*(1+a)^2+7*(a+1)+20>0
    8000(1+i)^2-7500(1+i)-1800>0
    8000x^2-7500x-1800>0
    8000x^2-75x-18>0
    -2000+500/(1+r)+700/(1+r)^2+2000/(1+r)^3＞0
    -2000+500/(1+9%)+700/(1+9%)^2+2000/(1+9%)^3＞0
    80r^2+85r-13>0
    -2000+500/(1+X)+700/(1+X)^2+2000/(1+X)^3>-10000+800/(1+X)+2500/(1+X)^2+2000/(1+X)^3
    -20x^3+5x^2+7x+20>0
    80r^2-13+85r>0
    -2000+500/(1+r)+700/(1+r)^2>-10000+800/(1+r)+2500/(1+r)^2>0

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