1) Используя равенство 678 + 1357 – 2035, найдите: а) 2035 — 1357; 6) 2035 – 678. 2) С помощью сложения проверьте, верно ли равенство; а) 2158 — 599 1559; 6) 3052 - 2255 = 777​
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