\[Страница\ 14.\]
Вычисли (стр. 14)
\[\boxed{\mathbf{Вычисли}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[64\ :4 = (40 + 24)\ :4 =\]
\[= 40\ :4 + 24\ :4 = 10 + 6 = 16\]
\[7 \cdot 12 = 7 \cdot (10 + 2) = 7 \cdot 10 +\]
\[+ 7 \cdot 2 = 70 + 14 = 84\]
\[50\ :2 = (40 + 10)\ :2 =\]
\[= 40\ :2 + 10\ :2 = 20 + 5 = 25\]
\[39\ :3 = (30 + 9)\ :3 = 30\ :3 +\]
\[+ 9\ :3 = 10 + 3 = 13\]
\[\boxed{\mathbf{1}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[72 = 40 + 32\]
\[72\ :4 = (40 + 32)\ :4 = 40\ :4 +\]
\[+ 32\ :4 = 10 + 8 = 18\]
\[72 = 60 + 12\]
\[72\ :3 = (60 + 12)\ :3 = 60\ :3 +\]
\[+ 12\ :3 = 20 + 4 = 24\]
\[72 = 36 + 36\]
\[72\ :6 = (36 + 36)\ :6 =\]
\[= 36\ :6 + 36\ :6 = 6 + 6 = 12\]
\[\boxed{\mathbf{2}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[84\ :6 = (60 + 24)\ :6 =\]
\[= 60\ :6 + 24\ :6 = 10 + 4 = 14\]
\[57\ :3 = (30 + 27)\ :3 =\]
\[= 30\ :3 + 27\ :3 = 10 + 9 = 19\]
\[91\ :7 = (70 + 21)\ :7 =\]
\[= 70\ :7 + 21\ :7 = 10 + 3 = 13\]
\[3 \cdot 18 = 3 \cdot (10 + 8) = 3 \cdot 10 +\]
\[+ 3 \cdot 8 = 30 + 24 = 54\]
\[4 \cdot 17 = 4 \cdot (10 + 7) = 4 \cdot 10 +\]
\[+ 4 \cdot 7 = 40 + 28 = 68\]
\[6 \cdot 13 = 6 \cdot (10 + 3) = 6 \cdot 10 +\]
\[+ 6 \cdot 3 = 60 + 18 = 78\]
\[86\ :2 = (80 + 6)\ :2 = 80\ :2 +\]
\[+ 6\ :2 = 40 + 3 = 43\]
\[60\ :4 = (40 + 20)\ :4 =\]
\[= 40\ :4 + 20\ :4 = 10 + 5 = 15\]
\[93\ :3 = (90 + 3)\ :3 = 90\ :3 +\]
\[+ 3\ :3 = 30 + 1 = 31\]
\[68\ :2 = (60 + 8)\ :2 = 60\ :2 +\]
\[+ 8\ :2 = 30 + 4 = 34\]
\[96\ :3 = (90 + 6)\ :3 = 90\ :3 +\]
\[+ 6\ :3 = 30 + 2 = 32\]
\[88\ :4 = (44 + 44)\ :4 = 44\ :4 +\]
\[+ 44\ :4 = 11 + 11 = 22\]
\[\boxed{\mathbf{3}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 6 \cdot 4 = 24\ (кг) - винограда\ \]
\[в\ 4\ корзинах.\]
\[2)\ 32 - 24 = 8\ (кг) -\]
\[винограда\ в\ пятой\ корзине.\]
\[Ответ:\ \ на\ 15.\]
\[\boxed{\mathbf{4}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[Цена\ билета\ 30\ рублей.\ \]
\[Пассажир\ отдал\ в\ кассу\ 100\ \]
\[рублей\ для\ покупки\ \]
\[трех\ билетов.\]
\[1)\ 30 \cdot 3 = 90\ (рублей) - стоят\]
\[\ три\ билета.\]
\[2)\ 100 - 90 = 10\ (рублей) -\]
\[сдача.\]
\[Ответ:\ \ 10\ рублей.\]
\[\boxed{\mathbf{5}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[39\ :3 \cdot 4 = 13 \cdot 4 = 52\]
\[64\ :2 \cdot 3 = 32 \cdot 3 = 96\]
\[48\ :4 \cdot 8 = 12 \cdot 8 = 96\]
\[100 - 3 \cdot 4 = 100 - 12 = 88\]
\[6 \cdot 9 + 48\ :6 = 54 + 8 = 62\]
\[66\ :3 \cdot 2 - 5 = 22 \cdot 2 - 5 =\]
\[= 44 - 5 = 39\]
\[84 - (48 + 26) = 84 - 74 = 10\]
\[23 + (75 - 48) = 23 + 27 = 50\]
\[53 - (53 - 40) =\]
\[= 53 - 53 + 40 = 40\]
\[\boxed{\mathbf{6}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[L_{\text{ABCD}} = 3 + 3 + 1 = 7\ см.\]
\[L_{\text{KOCEM}} = 25 + 20 + 20 + 25 =\]
\[= 90\ мм = 9\ см.\]
\[L_{\text{ABCD}} < L_{\text{KOCEM}}.\]
\[\boxed{\mathbf{7}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[Прямые\ углы:\ \ \angle B;\ \ \ \angle C;\ \ \ \angle T;\ \]
\[\ \ \angle K.\]
\[Тупые\ углы:\ \ \angle A;\ \ \ \angle M;\ \ \angle D;\ \ \]
\[\angle O;\ \ \ \angle E.\]
\[Острые\ углы:\ \angle P;\ \ \angle S;\ \ \angle N.\]