6 25b4c3 (2b2c)3 (m7n5)² (mn³)3

6) A: $$25b^4c^3 \cdot (2b^2c)^3 = 25b^4c^3 \cdot 8b^6c^3 = 200b^{4+6}c^{3+3} = 200b^{10}c^6$$

B: $$(m^7n^5)^2 \cdot (mn^3)^3 = m^{14}n^{10} \cdot m^3n^9 = m^{14+3}n^{10+9} = m^{17}n^{19}$$

Ответ: A: $$200b^{10}c^6$$, B: $$m^{17}n^{19}$$