x^3-9x^2+15x+9=0
    0.39725/(1+1.69870x)+0.02729/(1+0.11723x)-0.27310/(1-0.51209x)
    1/3x∧2-5/8x-4＝0
    3/4-2x＝2
    0.58516/(1+1.05164x)-0.04292/(1-0.19140x)-0.14560/(1-0.66379x)
    18%*W+13%*(1-W)=16%
    (56.00×0.4×0.4)/8
    0.46899/（1+1.37940x)-0.00848/（1-0.03688x）-0.25315/（1-0.58872x）
    0.28/(0.2-x)=ln((0.2-x)*(0.15-x)/(0.11-x)^2)
    14×5
    4/5×2＝
    x＋0.2=6
    1.0×1.3×0.785×1.0
    1.0×1.5×2.5
    0.28/(0.2-x)=ln(((0.2-x)/(0.11-x))^2/((0.2-x)/(0.15-x)))
    2^sqrt2
    1.0×[1.3×（0.785+24×1.5+1.5×1.5）+1.5×0.7×（3.0+2.0）]×1
    0.28/(0.2-x)=ln((0.2-x)*(0.15-x)/(0.11-x))
    3.5x-2.5x＝15
    (0.7-0.2)/(0.2-x)+ln((0.2-x)/(0.15-x))=2*((0.31-0.2)/(0.2-x)+ln((0.2-x)/(0.11-x)))

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