[1.2×(0.71+0.89+2.13+39)×1.7+1.2×0.64+1.4×(2.5+2+2)×1.7]/2
    18.2/(2×14.2)
    ［1-1/（1+8.0%）^53.80］/［1-1/（1+8.0%）^70］
    4655000/(1.0×237000×215)
    1.07-66.04/44000
    1400/21.2
    124cos24.5/cos20
    3.14*5+0.4cos20
    arctan0.5
    tan0.5
    arctan0.2
    ［1-1/（1+8.0%）^53.80］/［1-1/（1+8.0%）^70］
    307.87×[(1.0475)^2-1]+80.00×[(1.0475)^1-1]
    307.87×[(1.0475)^2-1]+80.00×[(1.0475)^2/2-1]
    (17960.5×133940)/(23700000×8)
    4655000/(1.05×237000)
    [1.0×(0.71+0.89+2.13)+1.0×(2.5+2+2)]×0.35
    [1.0×(0.71+0.89+2.13)+1.0×(2.5+2+2)]×0.35
    1.4×(2.5+2+2)×0.35
    1.2×(0.71+0.89+2.13)×0.35

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