Карточка 6
- \( 1,25 \cdot 8,3 - 0,8 - 6 \cdot 1,2 = 10,375 - 0,8 - 7,2 = 9,575 - 7,2 = 2,375 \)
- \( \frac{6,6 - 3,2}{9,6} = \frac{3,4}{9,6} = \frac{34}{96} = \frac{17}{48} \)
- \( 3 - 4x = -8x + 9 \)
\( -4x + 8x = 9 - 3 \)
\( 4x = 6 \)
\( x = \frac{6}{4} = 1.5 \) - \( x^2 - 25 = 0 \)
\( x^2 = 25 \)
\( x = \pm 5 \)
Ответ: 1. 2,375; 2. 17/48; 3. 1,5; 4. -5.