\[\mathbf{Страница\ 49.}\]
\[\boxed{\mathbf{11.}}\]
\[\textbf{а)}\ 96\ :x = 8\]
\[x = 96\ :8\]
\[x = 12.\]
\[\textbf{б)}\ x\ :60 = 14\]
\[x = 14 \cdot 60\]
\[x = 840.\]
\[\textbf{в)}\ 105\ :x = 35\]
\[x = 105\ :35\]
\[x = 3.\]
\[\textbf{г)}\ x\ :15 = 80\]
\[x = 80 \cdot 15\]
\[x = 1200.\ \]
\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\ 2\ км = 2000\ м\]
\[\textbf{б)}\ 8600\ см = 86\ м\]
\[\textbf{в)}\ 16\ дм = 1\ м\ 6\ дм\]
\[\textbf{г)}\ 34\ 000\ мм = 34\ м\]
\[\boxed{\mathbf{2.}}\]
\[\textbf{а)}\ 16\ км = 16\ 000\ м =\]
\[= 160\ 000\ дм\]
\[\textbf{б)}\ 38\ м = 380\ дм\]
\[\textbf{в)}\ 8300\ мм = 83\ дм\]
\[\textbf{г)}\ 39\ 000\ мм = 390\ дм\]
\[\boxed{\mathbf{3.}}\]
\[\textbf{а)}\ 86\ м = 8600\ см\]
\[\textbf{б)}\ 4\ км = 4000\ м = 400\ 000\ см\]
\[\textbf{в)}\ 7400\ мм = 740\ см\]
\[\textbf{г)}\ 18\ 000\ мм = 1800\ см\]
\[\boxed{\mathbf{4.}}\]
\[\textbf{а)}\ 3\ м\ 2\ дм\ 7\ см\ 1\ мм = 3271\ мм\]
\[\textbf{б)}\ 279\ м\ 2\ см = 27\ 902\ см\]
\[\textbf{в)}\ 4\ км\ 308\ м\ 5\ дм = 43085\ дм =\]
\[= 4\ 308\ 500\ мм\]
\[\boxed{\mathbf{5.}}\]
\[(405 \cdot 720 - 184\ 699)\ :53 =\]
\[= 2017\]