Раскройте скобки:
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)
7)(m-n)-(k-t)
8)(t+s)+(-p-m)
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