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
    28+2x=28
    x+6=10
    （X-1）*1000=136.71
    x=36450+x*1.33%
    2X^3-X^2-3X-1=0
    20x=500

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