1. [-9+(-3)•(-4)]•[2-(-6):3)]-(+12)=
=(-9+12)•4-12
=12-12
=0
2.
[tex] { - 2}^{6} \times { - 2}^{5} \times { - 2}^{11} = \\ { - 2}^{11 \times} \times { - 2}^{11 } = { - 2}^{22} [/tex]
