33+x-(600+x)*6%/4=60
    2s^3+7.5s^2+6^s+2.5=0
    x-x*6%/4=19.7
    5024x-241x²＝34384
    （38.5-x）/（255-x）=0.1
    3x²+x-1=0
    3x²+2x-2=0
    0.618x=1415
    0.4126＝-0.0187x^2+0.2971x+0.3291
    0.2662＝-0.0187x^2+0.2971x+0.3291
    0.1545＝-0.0187x^2+0.2971x+0.3291
    0.1255＝-0.0187x^2+0.2971x+0.3291
    0.0778＝-0.0187x^2+0.2971x+0.3291
    x+1＝1
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-800)*0.2=1000
    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

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