Question

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)

Answer 1

1)(a-b)+(c-d)= a+c-b-d
2)-(-a+b)-(-c-d)=a+c+d-b
3)(a+b)-(c+d)=a+b-c-d
4)-(a+b)+(-c-d)=b-a-c-d
5)-(a-b)-(c+d)=b-a-c-d