\[\boxed{\mathbf{1.}}\]
\[\boxed{\mathbf{2.}}\]
\[\textbf{а)}\ 7395 + 284 + 8 + 5 + 16 =\]
\[= (7395 + 5) + (284 + 16) + 8 =\]
\[= 7400 + 300 + 8 = 7708\]
\[\textbf{б)}\ 371 + 47 + 15 + 853 + 229 =\]
\[= (371 + 229) + (47 + 853) + 15 =\]
\[= 600 + 900 + 15 = 1515\]
\[\boxed{\mathbf{3.}}\]
\[1)\ 24 - 6 = 18\ (клякс) -\]
\[равные\ части\ у\ Буратино\ и\ \]
\[Незнайки.\]
\[2)\ 18\ :2 = 9\ (клякс) - у\ \]
\[Незнайки.\]
\[3)\ 9 + 6 = 15\ (клякс) - у\ \]
\[Буратино.\]
\[Ответ:9\ клякс\ и\ 15\ клякс.\]
\[\boxed{\mathbf{4.}}\]
\[500\ 600 - x = 5284\]
\[x = 500\ 600 - 5284\]
\[x = 495\ 316.\]
\[Проверка:\]
\[500\ 600 - 495\ 316 = 5284\]
\[5284 = 5284.\]
\[\boxed{\mathbf{5.}}\]
\[\textbf{а)}\]
\[\textbf{б)}\ Эта\ фигура -\]
\[многоугольник.\]