a) \(20 \cdot 4 = 80\)
\[20 \cdot 4 = 80\]
б) \((62 + 18) : 4 \cdot 5\)
\[(62 + 18) : 4 \cdot 5 = 80 : 4 \cdot 5 = 20 \cdot 5 = 100\]
c) \(356 + 272\)
356
+272
-----
628
\[356 + 272 = 628\]
\(585 - 183\)
585
-183
-----
402
\[585 - 183 = 402\]
g) Решим уравнения:
\(y + 60 = 150\)
\[y = 150 - 60\]
\[y = 90\]
\(8 \cdot x = 80\)
\[x = 80 : 8\]
\[x = 10\]