X+(X/1.01*0.01)+((X+(X/1.01*0.01))-800)*0.2=1400
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-(X+(X/1.01*0.01))*0.2)*0.2=1000
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-(X+(X/1.01*0.01))*0.2)*0.2=1400
    X+(X/1.01*0.01)+(((X+(X/1.01*0.01))-(X+(X/1.01*0.01)*0.2)*0.2)=6000
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-(X+(X/1.01*0.01))*0.2)*0.2=6000
    160x+x/2+7（x-1000）+158（x+1000）+x+52（x+500）+x/6+x/12*8+（x-500）/2=4948953.49
    1-logx
    1-1/(1+0.1244x)²=0.847
    18%*X+13%*(1-X)=16%
    18%*X+13%*(1-X)=16%
    18%*X+13%*(1-X)=16%
    18%*X+13%*(1-X)=16%
    1.34*（x-0.7)^2*(1+0.1x)=0.1
    （52-x)(48-x)=2300
    arctan（10*（x^2））-arctan20x=30
    arctan（x^3/5）-arctan2x=50
    arctan（x^3/5）-arctan2x=30
    arctan（x*（5^（1/3）））-arctan（2*（5^（1/3）））=30
    arctan（10x）-arctan（2x）=30
    arctan100x-arctan2x=30

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