X/6-x/8
    (x-x/1.09*0.03)*0.02=3297270.8
    xxx-9xx+18x-1=0
    (x-x/1.09*0.03)*0.02=3297270.83
    ln（x+1)=3
    x^2+x=930
    （X+9）/(X+100)=0.35
    （X+8）/(X+100)=0.35
    （X+7）/(X+100)=0.35
    （X+6）/(X+100)=0.35
    （X+5）/(X+100)=0.35
    （X+20）/(X+100)=0.35
    （X+10）/(X+100)=0.35
    （X+15）/(X+100)=0.35
    K=741.5+14.83+0.01K+16.71+0.0002K+38.65+0.0005K+0.0529K
    K=741.5+14.83+0.01K+16.71+0.0002K+38.65+0.0005K+0.0538K
    X/87-30/1900-0.04-2/45-2/44.7=0.002（X+74）
    x^2-30*x-18000=0
    （3-x）（3+x）
    x^3-10x^2-4x+4

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