-2+-3
    2+-3
    ((0.811*60.12)+(0.189*19.43))/1.006489
    0.811*39.77/1.006489
    0.811*19.63/1.006489
    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

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