52) $$(5c^3+ 3h^2)^2 = (5c^3)^2 + 2 \cdot 5c^3 \cdot 3h^2 + (3h^2)^2 = 25c^6 + 30c^3h^2 + 9h^4 $$
Ответ: $$25c^6 + 30c^3h^2 + 9h^4$$