Question

Выполните действие
1) (х+у)(х-у)=
2) (Р+Т)(Р-Т)=
3)(m+5)(m-5)
4)(n+1)(n-1)
5)(5a-b)(5a+b)
6)(2m+3)(2m-3)
7)(2a-3b)(3b+2a)
8)(7m+3n)(7m-3n)
9)(7m+3n)(7m-3n)

Answer 1

1) х^2-ху+ух-у^2
2) Р^2-РТ+ТР-Т^2
3) m^2-5m+5m-25
4) n^2-n+n-1
5) 25a^2+5ab-5ab-b^2
6) 4m^2-6m+6m-9
7) 6ab-4a^2-9b^2-6ab
8) 49m^2-21mn+21mn-9n^2
9) 49m^2-21mn+21mn-9n^2