cos1.10125
    cos0.845
    sin1.69
    sin1.48719
    sin2.2025
    3.124×2.7×10.1+10×2.7
    3.124×3.1×10.1+10×3.1
    80*1000*40 = 80*1000*38 =
    650/16.163 = 650/16.195 = 650/16.325 = 650/16.455 =
    (1+6%)e2
    1600/(1+6%)e4-(1+6%)e2
    1600/(1+6%)e4
    2.275/2×(46.911+52.557)
    2.275/3×(2×46.911+52.557)/(46.911+52.557)
    2.275/3×(2×27.107+52.557)/(27.107+52.557)
    2.275/2×(27.107+52.557)
    5.3/2×(27.107+86.419)
    5.3/3×(2×27.107+86.419)/(27.107+86.419)
    1+3
    1.4/3×(2×86.419+108.17)/(86.419+108.17)

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