Помогите раскрыть скобки:
1)a+(-b-c-d-c-f)=
2)a-(b-c+d-c+f)=
3)a-(-b+c-d+c-f)=
4)a+(b-c+d-c+f)=
5)a+(b+c-d+c+f)=
1)а-b-c-d-c-f=a-b-2c-d-f
2)a-b+c-d+c-f
3)a+b-c+d-c+f
4)a+b-c+d-c+f
5)a+b+c-d+c+f
1) a+(-b-c-d-c-f)=a-b-2c-d-f
2) a-(b-c+d-c+f)=a-b+2c-d-f
3) a-(-b+c-d+c-f)=a+b-2c+d+f
4) a+(b-c+d-c+f)=a+b-2c+d+f
5) a+(b+c-d+c+f)=a+b+2c-d+f