Ответ:

Объяснение:

1) 49a - 64ab + 16b = 49a - 64ab + 16b

= (49a - 64ab) + 16b

= (49a - 64ab + 16b^2) - 16b^2

= 49a - 64ab + (16b^2 - 16b^2)

= 49a - 64ab

2) 25c - 30ca + 9a = 25c - 30ca + 9a

= (25c - 30ca) + 9a

= (25c - 30ca + 9a^2) - 9a^2

= 25c - 30ca + (9a^2 - 9a^2)

= 25c - 30ca

3) 4p + 20p + 25 = 4p + 20p + 25

= (4p + 20p) + 25

= (4p + 20p + 25^2) - 25^2

= 4p + 20p + (25^2 - 25^2)

= 4p + 20p

4) 16k - 24k + p = 16k - 24k + p

= (16k - 24k) + p

= (16k - 24k + p^2) - p^2

= 16k - 24k + (p^2 - p^2)

= 16k - 24k