§ Задание 10
\[\boxed{\mathbf{2}\mathbf{.}\mathbf{10}}\]
\[\textbf{а)}\ (397 + 614) + 386 =\]
\[= 397 + (614 + 386) =\]
\[= 397 + 1000 = 1397\]
\[\textbf{б)}\ 544 + (56 + 1437) =\]
\[= (544 + 56) + 1437 =\]
\[= 600 + 1437 = 2037\]
\[\boxed{\mathbf{2}\mathbf{.}\mathbf{10}}\]
\[\textbf{а)}\ (397 + 614) + 386 =\]
\[= 397 + (614 + 386) =\]
\[= 397 + 1000 = 1397\]
\[\textbf{б)}\ 544 + (56 + 1437) =\]
\[= (544 + 56) + 1437 =\]
\[= 600 + 1437 = 2037\]