2283750x∧2＋83813625x＋524349000＝864000000
    2475000000=13.8*1600x（1176-x/2）
    x÷（1+x）^2＝25/3
    25x^2+47x+25＝0
    25x∧2＋47x+25=0
    （1+x）/（1+2%）-1=10%
    59x(x^5-1)/(x-1)+1250x^5=1000
    59x(x^5-1)/(x-1)+1250x^5=1000
    （1+x）/（1+2%）-1=10%
    1+x/1+2%-1=10%
    cox^2
    x^0.333
    6/x=-3/4x+3
    x-arcsinx
    59/(1+x)+59/(1+x)^2+59/(1+x)^3＝1000
    236876.89x^2=5.102x^（2/3）+0.641
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*3.140601)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*3.295142)
    (X/X+1)*100%=80%
    X/X+1=0.8

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