227x²+384x-12000=0
    x*(0.21-0.5*x)^0.5/((0.12-x)*(0.09-0.5*x)^0.5)=85.3
    x*(1-0.5*x)^0.5/((0.12-x)*(0.09-0.5*x)^0.5)=85.3
    -3/2000*x^2 + 5/4*x + 1500
    x*(1.5-x)^0.5/((1-x)*(0.5-0.5*x)^0.5)=1.92
    g+（g-8%）*0.375=0.25
    （44x/100）+（44x/84）＝2.64
    （16x+302.4）/60＝4.94
    （x-25+10）*0.6/（（x-25+10）*0.6+（180-x+15）*1.3)＝32.6%
    （x-25+10）*0.6/（（x-25+10）*0.6+（180-x+15）*1.3)＝24.6%
    K(K+1)=380
     (186542136.77-X)/1.09*0.02 = 2384573.83
    (X-186542136.77)/1.09*0.02=2384573.83
    1.11+x＝（3.85+x）*0.3
    sqrt(x-2022)+sqrt(x-2023)+sqrt(x-2024)=3
    10lgX=-3
    x^2+x-7=0
    2^x+x-7=0
    100=5+100/(1+i)^3+6/(1+i)+6/(1+i)^2+6/(1+i)^3
    95*(1+i)=100/(1+i)^3+6/(1+i)+6/(1+i)^2+6/(1+i)^3

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