（√z-1）^3=8
    （√z-1）^3=8
    X*X - X*2 = 36
    X^2 - X*2 = 36
    1/x
    84.1 = 30.071ln(x) + 5.7459
    50 = 30.071ln(x) + 5.7459
    118x-77=422
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.68909)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.500026)
    20000x＝7682.2（1-（1-x）^（-3））
    20000x/（1-（1+x）^（-3））＝7682.2
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.509415)
    3s^2+4s＋2=0
    0.458x^3-0.0314x^2-5＝0
    0.168=0.137*Z^(-3)+0.119*Z^(-2)+0.269*Z^(-1)-0.019
    84.1 = 31.034ln(x) + 4.8484
    50 = 31.034ln(x) + 4.8484
    30*x^20+30*x^19+30*x^18 =153.822
    3x+3x^（8/12）-3x^（2/12）＝6

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