\[\boxed{\text{90\ (90).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\ Если\ d = 2,\ то:\]
\[16 \cdot d = 16 \cdot 2 = 32;\]
\[16\ :d = 16\ :2 = 8.\]
\[2)\ Если\ d = 4,\ то:\]
\[16 \cdot d = 16 \cdot 4 = (10 + 6) \cdot 4 =\]
\[= 40 + 24 = 64.\ \]
\[16\ :d = 16\ :4 = 4.\ \]
\[3)\ Если\ d = 8,\ то:\]
\[16 \cdot d = 16 \cdot 8 = (10 + 6) \cdot 8 =\]
\[= 80 + 48 = 128.\]
\[16\ :d = 16\ :8 = 2.\ \]
\[4)\ Если\ d = 1,\ то:\]
\[16 \cdot d = 16 \cdot 1 = 16.\]
\[16\ :d = 16\ :1 = 16.\ \]