\[\boxed{\text{35\ (35).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\ 236 + 189 + 308 = 733.\]
\[2)\ (200 - 30) \cdot 5 = 170 \cdot 5 =\]
\[= (100 + 70) \cdot 5 =\]
\[= 500 + 350 = 850.\]
\[300 + 90\ :3 = 300 + 30 = 330.\]
\[50 \cdot 4 + 90 \cdot 3 = 200 + 270 =\]
\[= 470.\]
\[70 \cdot 3 + 80\ :10 = 210 + 8 =\]
\[= 218.\]
\[27\ :(9 \cdot 3) = 27\ :27 = 1.\]
\[68\ :2\ :2 = 34\ :2 = 17.\ \]