Решебник по математике 5 класс Мерзляк ФГОС Задание 494

 

\[\boxed{\ \mathbf{494\ (494)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ (x - 23)\ :26 = 8\]

\[x - 23 = 8 \cdot 26\]

\[x - 23 = 208\]

\[x = 208 + 23\]

\[x = 231\]

\[Ответ:231.\]

\[2)\ 1728\ :(56 - x) = 36\]

\[56 - x = 1728\ :36\]

\[56 - x = 48\]

\[x = 56 - 48\]

\[x = 8\]

\[Ответ:8.\]

\[\boxed{\ \mathbf{494.}}\]

\(1)\ x^{2} - 14;\ \ если\text{\ \ }x = 5;\ 18:\)

\[5^{2} - 14 = 25 - 14 = 11;\]

\[18^{2} - 14 = 324 - 14 = 310.\]

\[2)\ 2y^{2} + 13;\ \ если\text{\ \ }y = 6;100:\ \]

\[2 \cdot 6^{2} + 13 = 2 \cdot 36 + 13 =\]

\[= 72 + 13 = 85;\]

\[2 \cdot 100^{2} + 13 =\]

\[= 2 \cdot 10\ 000 + 13 =\]

\[= 20\ 000 + 13 = 20\ 013.\]