\[\boxed{\text{245\ (245).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[(3000 + 240)\ :10 =\]
\[= 3240\ :10 = 324\]
\[(5050 - 50) \cdot 100 =\]
\[= 5000 \cdot 100 = 500\ 000\]
\[812 -^{2}398 \cdot^{1}2 = 812 - 796 =\]
\[= 16\]
\[669 +^{2}425{\ :}^{1}5 = 669 + 85 =\]
\[= 754\]
\[99\ :11 \cdot (3 \cdot 3) = 9 \cdot 9 = 81\]
\[72\ :(12 \cdot 6) \cdot 4 = 72\ :72 \cdot 4 =\]
\[= 1 \cdot 4 = 4\]