ГДЗ по математике 5 класс Виленкин ФГОС Часть 1, 2 Часть 2. Параграф 5. Обыкновенные дроби Задание 536

\[\boxed{\text{5.536.}}\]

\[1)\ (3x + 5x) \cdot 45 = 1080\]

\[8x \cdot 45 = 1080\]

\[8x = 1080\ :45\]

\[8x = 24\]

\[x = 24\ :8\]

\[x = 3.\]

\[2)\ (9x - 4x) \cdot 72 = 1080\]

\[5x = 1080\ :72\]

\[5x = 15\]

\[x = 15\ :5\]

\[x = 3.\]

\[3)\ (10z - 4z)\ :4 = 12\]

\[6z = 12 \cdot 4\]

\[6z = 48\]

\[z = 48\ :6\]

\[z = 8.\]

\[4)\ (8z + 10z)\ :9 = 16\]

\[18z = 16 \cdot 9\]

\[18z = 144\]

\[z = 144\ :18\]

\[z = 8.\]