8000 - 1800 ÷( 1 + r ) ÷ ( 1 + r ) >300 ÷ ( 1 + r )
    8000 - 1800 ÷( 1 + r ) * 2 >300 ÷ ( 1 + r )
    8000 - 1800 ÷ ( ( 1 + r ) * 2 ) >300 ÷ ( 1 + r )
    8000-1800÷((1+r)*2)>300÷(1+r)
    8000-1800/(1+r)*2>300/(1+r)
    80r*2+157r+59>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+800/(1+r)+2500/(1+r)^2+2000/(1+r)^3
    -2000+500/(1+r)^1 +700/(1+r)^2 +2000/(1+r)^3 <0
    -2000+500/(1+r)^1 +700/(1+r)^2 +2000/(1+r)^3 ≥0
    -2000+500/(1+r)^1 +700/(1+r)^2 +2000/(1+r)^3 >-10000+8000/(1+r)^1 +2500/(1+r)^2 +2000/(1+r)^3
    x/3≤3-(x-2)/2
    4x-7<5(x-1)
    38x^2+90x-1800＜0
    39x^2+90x-1800＜0
    -10000+8000(1+r)^-1+2500+(1+r)^-2+2000(1+r)^-3<0
    x+500>2x
     240 + 120 * x >144 * x + 144
    -2000+500/(1+i)+700/(1+i)^2+2000/(1+i)^3>-10000+8000/(1+i)+2500/(1+i)^2+2000/(1+i)^3
    144x+144<240+120x

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