§ Задание 11
\[\boxed{\mathbf{2}\mathbf{.}\mathbf{11}}\]
\[\textbf{а)}\ 475 + 675 + 525 =\]
\[= 475 + (675 + 525) =\]
\[= 475 + 1200 = 1675\]
\[\textbf{б)}\ 272 + 464 + 336 =\]
\[= 272 + (464 + 336) =\]
\[= 272 + 800 = 1072\]
\[\boxed{\mathbf{2}\mathbf{.}\mathbf{11}}\]
\[\textbf{а)}\ 475 + 675 + 525 =\]
\[= 475 + (675 + 525) =\]
\[= 475 + 1200 = 1675\]
\[\textbf{б)}\ 272 + 464 + 336 =\]
\[= 272 + (464 + 336) =\]
\[= 272 + 800 = 1072\]