a)-3×[1-3×(-3+2×5)]=
=-3×[1-3×(-3+10)]=
=-3×(1-3×7)=
=-3×(1-21)=
=-3×-20=
=60.
b)-5×[-1+2×(-7+3×5)+6]=
=-5×[-1+2×(-7+15)+6]=
=-5×(-1+2×8+6)=
=-5×(-1+16+6)=
=-5×(15+6)=
=-5×21=
=-105.
c)-1×[-8×(-3+2×4)+6]-11=
=-1×[-8×(-3+8)+6]-11=
=-1×(-8×5+6)-11=
=-1×(-40+6)-11=
=-1×-34-11=
=34-11=
=23.