Question

раскройте скобки:
a+(b-c+d)
a-(b-c-d)
a-(b+c+d)
a+(b+c-d)
(a-b)+(c-d)
(x+y)-(z+t)

Answer 1

1)а+b-c+d
2)a-b+c+d
3)a-b-c-d
4)a+b+c-d
5)a-b+c-d
6)x+y-z-t

Answer 2

1)a+b-c+d
2)a-b+c+d
3)a-b-c-d
4)a+b+c-d
5)a-b+c-d
6)x+y-z-t