Question

Упростите:
1) (5+a)•(5-a)
2) (a+4)(a-4)
3) (c+7)(c-7)
4) (d+8)(8-d)
5) (m+n) (m-4)
6) (k+t) (k-t)
7 класс, алгебра

Answer 1

$25 - {a}^{2}$
${a}^{2} - 16$
${c}^{2} - 49$
$64 - {d}^{2}$
${k}^{2} - {t}^{2}$