\[Страница\ 7.\]
\[\boxed{\mathbf{13.}}\]
\[1)\ x + 14 = 20 + 14\]
\[x = 20.\]
\[2)\ y - 18 = 90 - 18\]
\[y = 90.\]
\[3)\ 56 - x = 56 - 11\]
\[x = 11.\]
\[4)\ x - 28 = 0\]
\[x = 28.\]
\[\boxed{\mathbf{14.}}\]
\[3 + 4 = 7\ (лет) - Юра\ старше\]
\[\ Вани.\]
\[Ответ:на\ 7\ лет.\]
\[\boxed{\mathbf{15.}}\]
\[Уменьшаемое\] | \[50\] | \[8\] | \[30\] | \[27\] | \[48\] | \[56\] | \[53\] | \[100\] | \[99\] |
---|---|---|---|---|---|---|---|---|---|
\[Вычитаемое\] | \[5\] | \[6\] | \[20\] | \[7\] | \[8\] | \[16\] | \[10\] | \[80\] | \[70\] |
\[Разность\] | \[45\] | \[14\] | \[10\] | \[20\] | \[40\] | \[40\] | \[43\] | \[20\] | \[29\] |
\[\boxed{\mathbf{16.}}\]
\[8 + 7 - 9 = 6\]
\[12 - 3 + 5 = 14\]
\[7 + 9 + 4 = 20\]
\[46 + 4 - 20 = 30\]
\[32 + 8 + 30 = 70\]
\[50 - 8 - 10 = 32\]