\[\boxed{\text{1076\ (1076).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ \sqrt[3]{5\sqrt{2} + 7} - \sqrt[3]{5\sqrt{2} - 7} =\]
\[= \sqrt[3]{\sqrt{50} + \sqrt{49}} - \sqrt[3]{\sqrt{50} - \sqrt{49}} =\]
\[= 2.\]
\[\textbf{б)}\ \sqrt[3]{2 + \sqrt{5}} + \sqrt[3]{2 - \sqrt{5}} =\]
\[= \sqrt[3]{\sqrt{4} + \sqrt{5}} - \sqrt[3]{\sqrt{4} - \sqrt{5}} = 1.\]