\[\boxed{\mathbf{369\ (369)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[Рисунок\ 137.\]
\[\textbf{а)}\ 14\ квадратов;\]
\[\textbf{б)}\ 13\ квадратов.\]
\[\boxed{\mathbf{369}\mathbf{\ (334)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ (636 + 927) + 364 =\]
\[= (636 + 364) + 927 =\]
\[= 1000 + 927 = 1927\]
\[2)\ (425 + 798) + 675 =\]
\[= (425 + 675) + 798 =\]
\[= 1100 + 798 = 1898\]
\[3)\ 212 + 493 + 788 + 807 =\]
\[= (212 + 788) + (493 + 807) =\]
\[= 1000 + 1300 = 2300\]
\[4)\ 161 + 455 + 839 + 945 =\]
\[= (161 + 839) + (455 + 945) =\]
\[= 1000 + 1400 = 2400\]