Помогите по алгебре!!!

Решите задачу:

$(1) \\ 1)\sqrt 5^{6} = \sqrt (5^{3})^{2} = 5^{3} =125 \\ 2)\sqrt 6^{8} = \sqrt (6^{4})^{2} = 6^{4}=1296 \\ 3) \sqrt 8^{4} = \sqrt (8^{2})^{2} =8^{2} =64 \\ 4) 0.25 * \sqrt 4^{10} =0.25* \sqrt (4^{5}) ^{2} =0.25*4^{5} = 0.25*1024=256 \\ 5) \sqrt 1.2^{2} * \sqrt 0.4^{4} = 1.2 * \sqrt (0.4^{2})^{2} = 1.2*0.16=0.192 \\ (2) 1) = a-2 \sqrt{ab} + b \\ 2)= p+6 \sqrt{pq} +9q \\ 3) = 16t + 40 \sqrt{ts} + 25s \\ 4) = 36n + 84 \sqrt{nm} + 49m$