2/sqrt(3)*500*(ln(0.1/0.05)+(0.1^2-0.1^2)/0.02)
    12/1.07+12/(1.07)^2+252/(1.07)^3
    2.4/1.07+2.4/(1.07)^2+42.4/(1.07)^3
    1000 * (1 + 3.5%/360)^90
    14.29 * (1+ 7.5%/360)^90
     70.61/1.02
    2/sqrt(3)*500*(ln(0.1/0.05)
    1 * (1+ 7.5%/360)^90
    70*(1+3.5%/360)^90
    (50-46.2)^(-0.25)×2388
    （46.2）^（-0.25）×2388
    5 ^{ -0.25 } =
    1.2 ^{ -0.25 } =
    sinπ/3
    3÷80
    24.26-850*0.3336+820*0.3974*0.9753
    -39300+2000/0.074 * (1-1/1.074^5)
    34635+35634
    arctan（0. 0166666666666666×π）
    arctan（0. 016666666666×π）

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