4) ((5^4)^3 · 5)/(5^10 · 5^3)

((5^4)^3 · 5)/(5^10 · 5^3) = (5^(4·3) · 5)/(5^(10+3)) = 5^(12+1-13) = 5^0 = 1. Ответ: 1.