b, ( -9² ) – 2 . { -45 – [- 12 + ( -72 ) :9 ] : ( -2) ² }

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1. `-9^2 – 2 . { -45 – [ -12 + (-72) : 9] : (-2)^2 }`

   `= -81 – 2. { – 45 – [ -12 -8] : 4}`

   `= -81 – 2 . { – 45 – (-20) : 4}`

   `=- 81-.2 .{ – 45 +5}`

   `= -81 -2 . (-40)`

   `= -81 + 80`

   `= -1`

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2. `b, ( -9² ) – 2. { -45 – [- 12 + ( -72 ) :9 ] : ( -2) ² }`

   `=81-2.{-45 – [- 12 -8]:4}`

   `=81-2.[-45-(-20:4)]`

   `=81-2.(-45+5)`

   `=81-2.(-40)`

   `=81–80`

   `=81+80`

   `=161`

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