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
    3（x+1/3）=2
    8:x=1/3:1/16
    8:x=16/3
    8:x=16/3
    8:x=1/3:1/16
    8:x=16/3
    [（x-8413.15)*0.75]/(30000*0.9)=0.12
    0.038=-0.0002x＾2+0.0491x+0.1224
    0.038=-0.0002x＾2+0.0491x+0.1224
    √(X^2-X-2)+√(2*X^2-X-1)=√(3X^2-2X-3)
    3x^2-10x-4＝0
    2*X^2-X-√(2*X^2-X+3)=3
    √(X^2-1)+√(X^2+4*X+3)=√(3*X^2+4*X+1)
    √(X+1)+√(2X-5)=3

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