a) 12 : ( 3 - 4 ) = 12 : 3 - 12 : 4
12 : ( - 1 ) = 4 - 12 : 4
12 : ( - 1 ) = 4 - 3
- 12 = 1
b) ( 15 - 27 ) : ( - 3 ) = - 5 - 27 : ( - 3 ) =
- 12 : ( - 3 ) =
4 = - 5 : ( - 3 )
4 = - 5 + 5
4 = 4
c ) 3 × ( - 5 ) ^ 2 = ( - 15 ) ^ 2
3 × 25 = 225
75 | = 225
d) ( - 3 ) ^ 2 × ( - 2 ^ 4 ) = ( - 12 ) ^ 2
9 × 16 = 144
144 = 144
