lny=－7.738
    450/(450-x)=1.5
    450/(450-X)=1.5
    -0.08x²+0.8x=0
    10000÷x+20000÷（x+66）＝150
    x+lnx=3
    y=995.7*(71.2*10^(-3))^3/(9.8*(80.07*10^(-5))^4)
    10000/x-9000/（x+5）=100
    10000/x-9000/（x+5）=100
    x-2x*1/5-8=x*24/25
    x+8.92*x^0.4=108.9
    x+8.92*x^0.4=77
    X×x×x-2x×x-5x+6=0
    15.6*x+4.3*(100-x)/100=9.2
    lnx=x/9
    （x-43.1-35）*（1-15%）/（500+500）=（x-43.1-200）*（1-15%）/（500+200）
    a^6+18a^4-36a^3+81a^2-324a+324=0
    a^6+18a^4-36a^3+81a^2-324a+324=0
    47％x＋80×72%=（80+X）×58%
    45％x＋80×72%=（80+X）×58%

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