Ответ: (2 + 7) — (3 + 1) = 9 — 4 = 5(3 + 5) — (0 + 6) = 8 — 6 = 2(4 + 4) — (2 + 5) = 8 — 7 = 1(9 + 0) — (7 + 2) = 9 — 9 = 0