\[Страница\ 101.\]
\[\boxed{\mathbf{5.}}\]
\[\textbf{а)}\ \frac{5\frac{2}{5} - 3\frac{11}{20}}{2\frac{3}{4}} = \frac{5\frac{8}{20} - 3\frac{11}{20}}{2\frac{3}{4}} =\]
\[= \frac{1\frac{17}{20}}{2\frac{3}{4}} = \frac{37}{20}\ :\frac{11}{4} = \frac{37 \cdot 4}{20 \cdot 11} = \frac{37}{55}\]
\[Ответ:\frac{37}{55}.\]
\[= \frac{0,72}{0,144} + \frac{0,72}{0,24} = 5 + 3 = 8\]
\[Ответ:8.\]
\[\boxed{\mathbf{6.}}\]
\[\frac{1}{2} = 0,5\]
\[\frac{2}{5} = 0,4\]
\[\frac{3}{5} = 0,6\ \]
\[\frac{1}{4} = 0,25\]
\[\frac{3}{4} = 0,75\]
\[\frac{3}{20} = 0,15\]
\[\frac{1}{25} = 0,04\]
\[\frac{7}{25} = 0,28\]
\[\frac{3}{50} = 0,06\]
\[\frac{3}{8} = 0,375\]
\[\frac{1}{8} = 0,125\]
\[\frac{1}{125} = 0,008\]
\[\boxed{\mathbf{7.}}\]
\[100\% - 74\% = 26\% = 0,26\]
\[78\ :0,26 = 300\ (кг) - свежего\ \]
\[цвета\ надо\ собрать.\]
\[Ответ:300\ кг.\]