Question

ajutor va rog la algebra cl 7 ​

Answer 1

Răspuns:

Explicație pas cu pas:

1)

a + b^2 - (b^2 + 2bc + c^2) = a + b^2 - b^2 - 2bc - c^2 = a - 2bc - c^2

2)

m + n - (m^2 - 2mn + n^2) = m + n - m^2 + 2mn - n^2

3)

16a^2 - 8ab + b^2 - (4a^2 + 12ab + 9b^2)

= 16a^2 - 8ab + b^2 - 4a^2 - 12ab - 9b^2

= 12a^2 - 20ab - 8b^2

Answer 2

$a + {b}^{2} - {(b + c)}^{2} = a + b - ( {b}^{2} + 2bc + {c}^{2} ) \\ a + {b}^{2} - {b}^{2} - 2bc - {c}^{2} \\ a - 2bc - {c}^{2}$

$m + n - {(m - n)}^{2} \\ m + n - {m}^{2} + 2mn - {n}^{2}$

$16 {a}^{2} - 8ab + {b}^{2} - (4 {a}^{2} + 12ab + 9 {b}^{2} ) \\ 16 {a}^{2} - 8ab + {b}^{2} - 4 {a}^{2} - 12ab - 9 {b}^{2} \\ 12 {a}^{2} - 20ab - 8 {b}^{2}$