565x+15300=28280
    565x+16200=28280
    1-a=-0.1
    -0.0023x^2+0.3893x-20.68=-18
    0.6-0.2-(1+0.25)/0.25*0.1*(1-a)=0
    x^3-3x^2+11x-9
    3-e^x
    2x^2-8x+10
    1.25x÷0.25＝4
    0.4-(1+0.25)/0.25*0.1*(1-a)=0
    -0.0023x^2+0.3856x-20.609=-18
    560x+17100=18230
    -0.0023x^2+0.3856x-20.609=-12
    560x+16200=18230
    560x+15300=18230
    560x+14400=18230
    560x+13500=18230
    560x+12600=18230
    560x+11700=18230
    560x+10800=18230

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