Question

Пожалуйста помогите меня матимотичка сьест​

Answer 1

Пошаговое объяснение:

$1)( - 1 \frac{1}{3} - 3.5) \times ( - 1 \frac{1}{29} ) = ( - 1 \frac{1}{3} - 3 \frac{1}{2} ) \times ( - \frac{30}{29} ) = - (1 \frac{2}{6} + 3 \frac{3}{6} ) \times ( - \frac{30}{29} ) = - 4 \frac{5}{6} \times ( - \frac{30}{29} ) = \frac{29 \times 30}{6 \times 29} = 5$

$2)a)0.4x + 1.3 = - 0.7x - 3.1 \\ 1.1x = - 4.4 \\ x = - 4 \\ b)3 \frac{1}{4} - x = - 1 \frac{5}{12} \\ x = 3 \frac{1}{4} + 1 \frac{5}{12} \\ x = 3 \frac{3}{12} + 1 \frac{5}{12} \\ x = 4 \frac{8}{12} \\ x = 4 \frac{2}{3}$

$3)1.2(4 - 3a) + 0.4a - 5.8 = 4.8 - 3.6a + 0.4a - 5.8 = - 3.2a- 1 \\ \\ - 3.2( - \frac{5}{32} ) - 1 = \frac{32 \times 5}{10 \times 32} - 1 = \frac{1}{2} - 1 = 0.5 - 1 = - 0.5$