Question

Решите пример! 
 7^2х3^7:21^2

Answer 1

49х2187/441= 107163/441=243

Answer 2

7^2 * 3^7 / 21^2 = (7^2*3^7) / (7^2 * 3^2) = 3^7 / 3^2 = 3^(7-2) = 3^5 = 243