\[\mathbf{Страница\ 26.}\]
\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\ 51\ 780\]
\[\textbf{б)}\ 48\ 240\]
\[\textbf{в)}\ 30\ 745\]
\[\textbf{г)}\ 210\ 672\]
\[\textbf{д)}\ 23\ 808\ 000\]
\[\boxed{\mathbf{2.}}\]
\[\textbf{а)}\ 16 \cdot 10 = 160\]
\[\textbf{б)}\ 30 \cdot 100 = 3000\]
\[\textbf{в)}\ 138 \cdot 100 = 13\ 800\]
\[\textbf{г)}\ 500 \cdot 1000 = 500\ 000\]
\[\boxed{\mathbf{3.}}\]
\[\textbf{а)}\ 35 \cdot 3 = 105\]
\[\textbf{б)}\ 36 \cdot 8 = 288\]
\[\textbf{в)}\ 81 \cdot 9 = 729\]
\[\textbf{г)}\ 67 \cdot 5 = 335\]
\[\boxed{\mathbf{4.}}\]
\[\boxed{\mathbf{5.}}\]
\[\textbf{а)}\ 56 \cdot 206 + 44 \cdot 206 =\]
\[= (56 + 44) \cdot 206 =\]
\[= 110 \cdot 206 = 22\ 660\]
\[\textbf{б)}\ 128 \cdot 698 + 256 =\]
\[= 128 \cdot 698 + 128 \cdot 2 =\]
\[= 128 \cdot (698 + 2) = 128 \cdot 700 =\]
\[= 89\ 600\]
\[\boxed{\mathbf{6.}}\]
\[4\ мин = 240\ с.\]
\[240 \cdot 4 = 960\ (м) - пробежит\ \]
\[лошадь\ за\ 4\ мин.\]
\[Ответ:960\ м.\]
\[\boxed{\mathbf{7.}}\]
\[720\ :12\ :6 \cdot 6 = 60\ (км) -\]
\[прошла\ лошадь\ за\ 6\ ч.\]
\[Ответ:60\ км.\]