1) 5\a + 3a-5\a+1 2)p\q-p - p\q 3) n-1\2n - n+1\5n с чем можете

1) 5/a + 3a-5/a+1 = 5а+5+3а-5/а(а+1) = 8а/а(а+1) = 8/(a+1)
2) p/q-p - p/q = pq-pq+p^2/q(q-p) = p^2/q(q-p) = q/(q-p)
3) n-1\2n - n+1\5n = 5n-5-2n-2/10n= 3n-7/10n