ГДЗ по математике 4 класс Моро ФГОС Часть 1, 2 Часть 2 Задание 105

\[\boxed{\text{105.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[140\ :20 = 140\ :(2 \cdot 10) =\]

\[= (140\ :10)\ :2 = 14\ :2 = 7.\]

\[560\ :7 = 80.\]

\[8\ 100\ :900 = 8\ 100\ :(9 \cdot 100) =\]

\[= (8\ 100\ :100)\ :9 = 81\ :9 = 9.\]

\[3\ 200\ :800 =\]

\[= 3\ 200\ :(8 \cdot 100) =\]

\[= (3\ 200\ :100)\ :8 = 32\ :8 = 4.\]

\[500 + (600 - 3 \cdot 100)\ :10 =\]

\[= 500 + (600 - 300)\ :10 =\]

\[= 500 + 300\ :10 = 500 + 30 =\]

\[= 530.\]

\[9\ 000\ :(100 - 90)\ :9 \cdot 2 =\]

\[= 9\ 000\ :10\ :9 \cdot 2 =\]

\[= 900\ :9 \cdot 2 = 100 \cdot 2 = 200.\ \]