28.3+15.7
    √((121.2/253.23)^2+(259.71/408.5)^2 )
    √((121.2/1253.23)^2+(259.71/408.5)^2 )
    32.25×20×470
    √((121.2/109.32)^2+(259.71/176.25)^2 )
    352.5×500
    (109.08×10^6×210)/88200
    21.19×20×470
    1×(π×〖21.19〗^2)/4×310
    727.2/6
    454619196+251455
    1＋1
    1＋1
    1＋1
    (—33/2)÷(—52/1)
    13×(π×16^2)/4
    1.35×1.0×2×14.3×10^3×0.81
    √((1.8×1.8)/(0.9×0.9))
    1.116×324.5
    [〖1.8〗^2-(0.56+2×0.755)^2 ]/4

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