0.6×60×0.2
    0.1×60×〖0.2〗^2
    (0.677×45.1×〖0.3〗^4)/(100×6000×2.813×10^(-7) )
    1.5×10.8/0.015×10^(-3)
    0.54/(3.751×10^(-2) )
    0.6×60×0.3
    0.1×60×〖0.3〗^2
    1.1×[1.3×(1.32×26+0.135）+1.5×（2.5+2+2)]×1
    1.32×26+0.135+2.5+2+2
    2.21×0.98×0.5
    0.22×(1-〖0.94〗^5)/(1-0.94)
    1+1
    (0.9433*(1-0.9433^10))/(1-0.9433)
    √((55.18/109.32)^2+(90.32/176.50)^2 )
    (316.73×10^6×276.43)/969321.36
    √((55.18/109.32)^2+(131.87/176.50)^2 )
    (316.73×10^6×403.57)/969321.36
    3×(162868.74+23583.74+9298.74)+5×76413.54
    (3×(0+250+500)+5×680)/14
    (4×0+1×175+4×350+1×525+4×700)/14

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