Respostas

  • Usuário do Brainly
2014-07-28T16:42:10-03:00
A)
3(x+y)=3(5)=15

b)
7(x-y)=7(1)=7

c)
(x+y)(x-y)=5(1)=5

d)
(x+y)²=5²=25

e)
(x-y)²=1²=1
10 4 10