√((72.42/1.22)^2+〖75.11〗^2 )
    (283.9×10^3)/(7×2×270)
    (283.9×10^3)/(7×2×280)
    (42.59×10^6)/533230
    (42.59×10^6)/1187875
    √(〖80.29〗^2+3×〖61.55〗^2 )
    (283.9×10^3×480000)/(122000000×1×20)
    (283.9×10^3×529000)/(122000000×1×20)
    (42.59×10^6)/530435
    (42.59×10^6)/530435
    (42.59×10^6)/1355556
    283.9×0.15
    283.9×0.15
    √((47.32/109.32)^2+(133.09/176.50)^2 )
    √((47.32/109.32)^2+(133.09/176.50)^2 )
    (42.59×10^6×80)/(4×80^2 )
    283.9×0.15
    283.9/6
    √((56.48/280)^2+(56.48/160)^2 )
    (283.9×0.15×10^6)/(15×(π×80^3)/32)

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