\[Страница\ 32.\]
\[\boxed{\mathbf{30.}}\]
\[a = 17:\]
\[40 + a + 5 = 40 + 17 + 5 =\]
\[= 57 + 5 = 62.\]
\[a - 10 + 8 = 17 - 10 + 8 =\]
\[= 7 + 8 = 15.\]
\[\boxed{\mathbf{31.}}\]
\[Уменьшаемое\] | \[58\] | \[60\] | \[70\] | \[82\] | \[94\] | \[97\] | \[85\] |
---|---|---|---|---|---|---|---|
\[Вычитаемое\] | \[48\] | \[20\] | \[40\] | \[30\] | \[34\] | \[47\] | \[55\] |
\[Разность\] | \[10\] | \[40\] | \[30\] | \[52\] | \[60\] | \[50\] | \[30\] |
\[\boxed{\mathbf{32.}}\]
\[8 + 8 = 8 \cdot 2\]
\[10 + 10 + 10 = 10 \cdot 3\]
\[6 + 6 + 6 + 6 = 6 \cdot 4\]
\[1 + 1 + 1 + 1 = 1 \cdot 4\]
\[0 + 0 + 0 + 0 + 0 = 0 \cdot 5\]
\[15 + 15 + 15 = 15 \cdot 3\]
\[\boxed{\mathbf{33.}}\]
\[5 + 5 + 5 + 5 + 5 = 5 \cdot 4 =\]
\[= 20\ (пуговиц) - нужно\ для\ \]
\[4\ пальто.\]
\[Ответ:20\ пуговиц.\]