Question

Раскройте скобки:
1) (2а-7у)-(5а-7у)
2) (11р+9с)-(12+11р+9с)

Answer 1

$(2a - 7y) - (5a - 7y) = 2a - 7y - 5a + 7y = - 3a$
$(11p + 9c) -( 12 + 11p + 9c) = 11p + 9c -12 - 11p - 9c = - 12$