Question

срочно Алгебра 7 класс 13.2

Answer 1

Ответ:

$(x-a)(x+y)=x^2+xy-ax-ay\\\\(a+z)(n-m)=an-am+zn-zm\\\\(t+s)(b+k)=tb+tk+sb+sk\\\\(c-d)(x-y)=cx-cy-dx+dy\\\\(a+2)(b-3)=ab-3a+2b-6\\\\(4-b)(5+c)=20+4c-5b-bc\\\\(d-4)(t+5)=dt+5d-4t-20\\\\(k-6)(7-d)=7k-kd-42+6d$