a. \(\left(3^{12}+3^{11}\right):3^{10}=3^{11}\left(3+1\right):3^{10}=3.4=12\)
b. \(\left(2^{16}+2^4\right):\left(2^{12}+1\right)=2^4\left(2^{12}+1\right):\left(2^{12}+1\right)=2^4=16\)
c. \(\left(3^{15}.15-3^{15}.6\right):3^{16}=3^{15}.\left(15-6\right):3^{16}=9:3=3\)