1.1×[1.0×(2.12+0.103+39)+1.0×(2.5+0.78)]×1
    1.1×1.5×(2.5+0.78)×1
    1.1×1.3×(2.12+0.103+39)×1
    tan30*5.5
    tan20*5.5
    tan10*5.5
    tan45*5.5
    tan60*5.5
    (684.9×10^3)/(0.738×20407.8)
    arctan(113/550)
    arctan(113/550)
    arctan(113/550)
    arctan(113/550)
    arctan(113/550)
    arctan(113/550)
    arctan(0.01/5.5)
    arctan(0.01/5.5)
    √((9.0/1.22)^2+〖17.7〗^2 )
    (74.3×10^3)/(7×2×300)
    (74.3×10^3)/(7×2×590)

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