8000*(1.025^5-1)/0.025=
    2500*(1.015^2-1)/0.015=
    14:12
    19:6
    arctan1.227
    arctan(1.227/5)
    arctan1.227
    arctan1.227
    5（5）/6
    arctan (1.2/5)
    arctan(1.2/5)
    arctan1.2
    arctan1.2
    log(999.9999)
    （15+5+16+16+28）/5
    10^10
    2^2^2^2^2^2
    148{148[(137+3)-136]}=
    1/9801
    148{148[(137+3)-136]}=

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