1-0.810804
    (1.006489-0.989574)/(1.010536-0.989674)
    578*39
    1/1.010536
    e(0.013*√(0.65/1))
    e0.013√(0.65/1)
    （1+1%）^（0.65/1)-1
    log(2,7) A(2,7) C(2,7)
    16/3.14
    5/7-8/13+2/7
    41.67×1000^4/(100×2.1×10^5×197808)
    （101.325+553.7
    (48.44×1000)/(2×1274)
    4844000/(3.97×10^4 )
    (48.44×1000^2)/10
    (55.13×1000)/(0.808×384)
    1.35×(1.0+1.6×1.0×1+1.6×1.0×0.6×26)+1.4×(3+3+2)×1.6×1.0
    (68.57×1000)/(0.808×384)
    30.28×1.6
    (6.22×1600)/(2×10000)

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