2x*x-11x+6=0
    r^2+0.5r+0.5=0
    X-74/X-77＝2/1
    0.74x+x/25*3.6+7.2-x=0
    （X-1100*7200）/X=39.38%
    0.074*sin(x)/cos(x-5) + 0.01*(1+sin(x)) = 0.0482876929917119
    （7500+x-600-5000）/（1-3%）*3%=x
    （7500+x-600-5000）/（1-3%）*3%=x
    u＝tanu
    -x^2+10x+200
    -x^2+10x+200
    (x－1)²＝e
    10＝x²+x+1
    -2698.304*(1+x)^(-1)-1156.416*(1+x)^(-2)+5544.93*(1+x)^(-3)+7098.55354*(1+x)^(-4)+9066.907468*(1+x)^(-5)+9066.907468*(1+x)^(-6)+9066.907468*(1+x)^(-7)+9066.907468*(1+x)^(-8)+9066.907468*(1+x)^(-9)+9066.907468*(1+x)^(-10)=0
    352x=x^2+40000-22500
    -2698.304*(1+x)^(-1)-1156.416*(1+x)^(-2)=0
    X*（X+0.01）/（0.01-X）=1.8
    0.3x²-8.85x-6=0
    （374*50）+（X*2.5*50%）=452
    51635.208^2=(2/x)-(2/x^2)(1-e^(-x))

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