\[\boxed{\mathbf{1.}}\]
\[4000\ :100 = 40\]
\[27\ 000\ :1000 = 27\]
\[8\ 060\ 000\ :100 = 80\ 600\]
\[39\ 500\ 000\ :10\ 000 = 3950\]
\[56\ 000\ :700 = 80\]
\[280\ 000\ :40 = 7000\]
\[4\ 500\ 000\ :9000 = 500\]
\[360\ 000\ :18\ 000 = 20\]
\[\boxed{\mathbf{2.}}\]
\[\textbf{а)}\ a + b\]
\[3\ 901\ 868 + 148\ 739 =\]
\[= 4\ 050\ 607\]
\[\textbf{б)}\ c - d\]
\[5\ 020\ 070 - 423\ 272 =\]
\[= 4\ 596\ 798\]
\[\boxed{\mathbf{3.}}\]
\[= 36\ :9 - 3 - 56\ :14\ :4 =\]
\[= 4 - 3 + 1 = 2\]
\[\boxed{\mathbf{4.}}\]
\[1)\ 6 \cdot 9 + 15 \cdot (4 + 6) =\]
\[= 54 + 150 = 204\ \left( см^{2} \right) -\]
\[площадь\ закрашенной\ \]
\[фигуры.\]
\[2)\ 6 + 9 + 4 + 15 + (4 + 6) + (15 + 9) =\]
\[= 34 + 10 + 24 = 68\ (см) -\]
\[периметр\ закрашенной\ \]
\[фигуры.\]
\[Ответ:204\ см^{2};\ \ 68\ см.\]
\[\boxed{\mathbf{5.}}\]
\[50\ 000\ :1000 \cdot 100 = 5000\]