y=100 - 1997500/(15000+0+19975)
    y=100 - 1997500/(10000+5040+19975)
    y=100 - 1997500/(10000+0+19975)
    y=100 - 1997500/(3549+5040+19975)
    y=100 - 1997500/(3549+19975)
    y=100 - 1997500/(8500+19975)
    y=100 - 1997500/(3500+19975)
    3.14/(sqrt(1-0.48^2)x)=0.8
    e^(-3.14x/sqrt(1-x^2))=0.18
    x²+（x+3）²=17²
    100x+4x²=600
    4＋x=25+x*x
    4＋x=25+x
    283918.1=54.5x+0.0125x^2
    292-x=x+34
    2x^3+17x^2+28x-15=0
    2s^3+6s^2+8s+3=0
    S^3+5S^2+8S+3=0
    m^2-m=-1
    x*（x+39.99）=1111

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