1500*24/（1500*24+500*18+2500*16）
    135000*1.0365^30
    arctan4＝
    75/cos(10)
    75/cos(5)
    75/cos(1)
    10%/4
    5*25/9
    arccos(75/76)
    3*5/3
    10%/4
    10%/4
    125/27-5*25/9+3*5/3+5
    3+9-7*8/4 1=x+2
    1/6
    6-4
    arctan10
    arctan0.01
    arctan1
    {11}{8}

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