\[\mathbf{Страница\ 16.}\]
\[\boxed{\mathbf{6.}}\]
\[(394 + 468) - 94 =\]
\[= (394 - 94) + 468 =\]
\[= 300 + 468 = 768\]
\[\boxed{\mathbf{7.}}\]
\[Выучите\ правило.\]
\[\boxed{\mathbf{8.}}\]
\[\textbf{а)}\ (47 + 9) - 7 = (47 - 7) + 7 =\]
\[= 40 + 9 = 49\]
\[\textbf{б)}\ (464 + 369) - 64 =\]
\[= (464 - 64) + 369 =\]
\[= 400 + 369 = 769\]
\[\textbf{в)}\ (444 + 289) - 269 =\]
\[= 444 + (289 - 269) =\]
\[= 444 + 20 = 464\]
\[\boxed{\mathbf{9.}}\]
\[\textbf{а)}\ 86 - (26 + 46) =\]
\[= 86 - 72 = 14\]
\[\textbf{б)}\ 116 - (76 + 19) =\]
\[= (116 - 76) - 19 =\]
\[= 40 - 19 = 21\]
\[\textbf{в)}\ (386 + 139) - 286 =\]
\[= (386 - 286) + 139 =\]
\[= 100 + 139 = 239\]
\[\boxed{\mathbf{10.}}\]
\[1)\ 762\]
\[2)\ 234\]
\[3)\ 13\ 511\]
\[4)\ 78\ 959\]
\[\boxed{\mathbf{11.}}\]