-6x^2+1800x-162000＝0
    -x^2+1400x-162000＝0
    x/61.8+5/161.4＝(0.9975-0.001x)×26/93
    128+128（1+x）+128（1+x）^2＝608
    128+128（1+x）+128（1+x）^2
    x÷61.8+5/161.4＝(0.9975-x)×26/93
    100k^3-201k^2+924k-1476=0
    x²-3x+2=0
    x²-3x-2=0
    0.08X^3-0.8X^2-5＝0
    X^2-X=0
    0.08X^3-0.8^2-5=0
    z^3-0.75z^2-0.5z-1/16＝0
    100*t+t^2=100
    0.58-0.00725x^2-0.2625x=0
    9t^2+900=0.04t^4
    -2/25（x-2）^2+2=0
    3^x-1
    ln（x+√（1+x^2））
    1+0.156x^2-0.0032x^4=0

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