cos20
    arccos0.9715715785880156959258350629745155382137
    cos16.26
    arccos0.9328027726076631795135100442847057313394
    arccos0.908375
    [1-27/（27+23)×（1-2%)]×100%
    （0.01+0.0002）×20%
    （2606.5+104.26+60.30）×20%
    （0.01+0.0002）×30%
    （2606.5+104.26+60.30）×30%
    115.00×[（1+0.0435）^1-1]+（2300+150+20+21.5+78.20)[(1+0.0435)^0.5-1]
    0.00000001566991073^0.333333333
    (0.00000001566991073^0.333333333)*0.5
    0.00000001566991073^0.333333333
    1000000000000000000/891
    1000000000000/4949
    1000000000000/707
    1000000000000/4949
    5000000000000/4949
    2829000000000000/4949

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