598.794a-2.091*1.3*a*a/2=1197.456
    598.794a-1.138*1.3a*a=1197.456
    598 794a-1.138*1.3a^2=1197.456
    80（6.5-3x）²＝1000x
    80（6.5-3x）＝1000x
    x×2.75＝152.89-x
    x×2.55＝152.89-x
    x×2.35＝152.89-x
    x×2.15＝152.89-x
    x×1.95＝152.89-x
    x×1.75＝152.89-x
    X=8300+X*0.06/1.06+X*0.06*0.11/1.06+X*0.0003
    15980.1=(15660.25+200)/(1-(3%+X)*90/360)
    5/4x^2+4x-13=0
    x=380.6x^0.16-43.4
    25+x＝31.96+147.22-x
    x²-47x+172=0
    x²-7x+132=0
    x²-81/8 x+81/8
    x/10-x/20=0.02*x

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