a) (273 - 51) - [73 - (-149)]
= 273 - 51 - 73 - 149
= (273 - 73) - (51 + 149)
= 200 - 200
= 0
b) 130 - [13 . 3 - (19-16)2
= 130 - (39 - 32)
= 130 - (39 - 9)
= 130 - 30
= 100
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a) \(\left(273-51\right)-\left[73-\left(-149\right)\right]\)
\(=273-51-73-149\)
\(=\left(273-73\right)-\left(51+149\right)\)
\(=200-200\)
\(=0\)
b) \(130-\left[13.3-\left(19-16\right)^2\right]\)
\(=130-\left(39-3^2\right)\)
\(=130-\left(39-9\right)\)
\(=130-30\)
\(=100\)
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