\[\boxed{\mathbf{3.}\mathbf{185}}\]
Пояснение.
Решение.
\[\textbf{а)}\ 82 \cdot 7 = (80 + 5) \cdot 7 =\]
\[= 80 \cdot 7 + 5 \cdot 7 = 560 + 35 =\]
\[= 595\]
\[\textbf{б)}\ 8 \cdot 61 = 8 \cdot (60 + 1) =\]
\[= 8 \cdot 60 + 8 \cdot 1 = 480 + 8 = 488\]
\[\textbf{в)}\ 4 \cdot 302 = 4 \cdot (300 + 2) =\]
\[= 4 \cdot 300 + 4 \cdot 2 = 1200 + 8 =\]
\[= 1208\]
\[\textbf{г)}\ 5 \cdot 606 = 5 \cdot (600 + 6) =\]
\[= 5 \cdot 600 + 5 \cdot 6 = 3000 + 30 =\]
\[= 3030\]