550+27.5+60+20+21.5
    800+40+60+20+21.5
    465+23+60+20+21.5=
    835.89×[（1+0.0435）^1-1]
    835.89×[（1+0.0435）1-1]
    （835.89+60）×0.03
    100/（√3×37）
    100/√3×37
    tan(arccos0.897)-tan(arccos0.92)
    18*30
    [400*(150*80-120*50)*(150*80-120*50)]/(200*200*270*130)
    3/-√3-(-√3-2)
    3/√3-(√3-2)
    2^10/1
    2.1:1.4
    [（1+0.0435）^0.5-1]
    810.62×[（1+0.0435）^1-1]
    （810.62+60）×0.03
    857.54×0.7+622.44×0.3
    591.9×（1+0.0516）×1

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