Question

помогите пожалуйста даю 28 балов

Answer 1

1)

$1 - 4a + 4a = (1 - 2a) {}^{2}$

2)

$b {}^{2} + 20b + 100 = (b + 10) {}^{2}$

3)

$y {}^{2} - 2y + 1 = (y - 1) {}^{2}$

4)

$16a {}^{2} + 8ab + b {}^{2} = (4a + b) {}^{2}$

5)

$4a {}^{2} - 4ab + b {}^{2} = (2a - b { )}^{2}$

6)

$49x {}^{2} + 28xy + 4y {}^{2} = (7x + 2y {}^{2} )$