\[\boxed{\mathbf{Страница\ 64.\ }\mathbf{Еуроки\ - \ ДЗ\ без\ мороки}}\]
\[\boxed{\mathbf{3.\ }}\]
\[1)\ 600 + 20 = 620\ (человек) -\]
\[всего\ на\ борту.\]
\[2)\ 620\ :70 = 62\ :7 =\]
\[= 8\ (ост.\ 60)\]
\[Ответ:должно\ быть\ минимум\ \]
\[9\ шлюпок\ на\ борту\ корабля.\]
\[\boxed{\mathbf{4.\ }}\]
\[3 + 42\ :(x - 9) = 10\]
\[42\ :(x - 9) = 10 - 3\]
\[42\ :(x - 9) = 7\]
\[x - 9 = 42\ :7\]
\[x - 9 = 6\]
\[x = 6 + 9\]
\[x = 15\]
\[Ответ:\ \ x = 15.\]
\[(7 \cdot y - 5)\ :4 = 11\]
\[7 \cdot y - 5 = 11 \cdot 4\]
\[7 \cdot y - 5 = 44\]
\[7 \cdot y = 44 + 5\]
\[7 \cdot y = 49\]
\[y = 49\ :7\]
\[y = 7\]
\[Ответ:y = 7.\]
\[\boxed{\mathbf{5.\ }}\]
\[58\ 486 + 974\ 569 =\]
\[= 1\ 033\ 055\ \ (Е)\]
\[23\ 216\ 342 - 15\ 981 =\]
\[= 23\ 200\ 361\ \ (В)\]
\[26\ 040 \cdot 900 = 23\ 436\ 000\ \ \ (О)\]
\[303\ 600\ :60 = 30\ 360\ :6 =\]
\[= 5060\ \ (Н)\]
\[23\ 436\ 000\] | \[23\ 200\ 361\] | \[1\ 033\ 055\] | \[5060\] |
---|---|---|---|
\[\mathbf{О}\] | \[\mathbf{В}\] | \[\mathbf{Е}\] | \[\mathbf{Н}\] |
\[\boxed{\mathbf{6.\ }}\]
\[(9 \cdot 8 + 12)\ :(4 + 2) = 84\ :6 =\]
\[= 14\]
\[35\ :(5 + 2) \cdot (12 - 4) + 16 =\]
\[= 5 \cdot 8 + 16 = 56\]