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
    p-(p^(10/13))*(0.101325^(3/13))=16.6865*42.98/1000*0.3/10
    p-(p^(10/13))*(0.101325^(3/13))=16.6865*42.98/1000*0.3/10
    30*X^15+30*X^14+30*X^13=132.719
    30x^15+30x^14+30x^13 =132.719
    30x^15+30x^14+30x^13 =132.719
    30x^15+30x^14+30x^13 =132.719
    30x^15+30x^14+30x^13 =132.719
    30x^15+30x^14+30x^13 =132.719
    30x^15+30x^14+30x^13 =132.719
    2.7*X^0.89=335.65
    50 = 34.127ln(x) + 2.5703
    84.1 = 34.127ln(x) + 2.5703
    50 = 34.127ln(x) + 2.5703
    0.0089X² -3.4205X + 330
    0.0089X² -3.4205X + 330
    0.4344=0.137*Z^(-3)+0.119*Z^(-2)+0.269*Z^(-1)-0.019
    0.4344=0.137*Z^(-3)+0.119*Z^(-2)+0.269*Z^(-1)-0.019

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