Решебник по математике 5 класс Мерзляк ФГОС Задание 307

 

\[\boxed{\mathbf{307\ (307)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[\angle ABC = 106{^\circ};\ \ \ \angle ABD = 34{^\circ}.\]

\[\angle DBC = \angle ABC - \angle ABD =\]

\[= 106{^\circ} - 34{^\circ} = 72{^\circ}.\]

\[Ответ:\ \ 72{^\circ}.\]

\[\boxed{\mathbf{307}\mathbf{\ (272)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ (39 + x) - 84 = 78\]

\[39 + x = 78 + 84\]

\[x = 162 - 39\]

\[x = 123\]

\[Ответ:123.\]

\[2)\ (x - 83) + 316 = 425\]

\[x - 83 = 425 - 316\]

\[x = 109 + 83\]

\[x = 192\]

\[Ответ:192.\]

\[3)\ (600 - x) - 92 = 126\]

\[600 - x = 126 + 92\]

\[x = 600 - 218\]

\[x = 382\]

\[Ответ:382.\]

\[4)\ 253 - (x - 459) = 138\]

\[x - 459 = 253 - 138\]

\[x = 115 + 459\]

\[x = 574\]

\[Ответ:574.\]

\[5)\ 502 - (217 - x) = 421\]

\[217 - x = 502 - 421\]

\[x = 217 - 81\]

\[x = 136\]

\[Ответ:136.\]

\[6)\ 871 - (x + 157) = 385\]

\[x + 157 = 871 - 385\]

\[x = 486 - 157\]

\[x = 329\]

\[Ответ:329.\]