1.Раскройте скобки: (а-b)+(c-d)
(x+y)-(z+t)
(m-n)-(k-t)
(t+s)+(-p-m)
2.Раскройте скобки и упростите получившееся выражение:
(x+y)+(y-x)
(a-b)-(a-b)
(c-d)-(c+d)
(u+v)-(v-u)
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