Question

Помогите пожалуйста по математике, кто хорошо знает, не игнорьте ​

Answer 1

Ответ:

Пошаговое объяснение:

a) = (-4/9)a - (3/9)a + 2 = -(7/9)a + 2

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8,4*(x + 4,4) = 4,6*(3x + 5,1)

8,4x + 36,96 = 13,8x + 23,46

13,8x - 8,4x = 36,96 - 23,46

5,4x = 13,5

x = 13,5 : 5,4

x = 2,5

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(2/3)z = (2/9)z - 7/9 |*9

6z = 2z - 7

6z - 2z = -7

4z = -7

z = -7 : 4

z = -1,75

Answer 2

3.

$- \frac{4}{9} a - \frac{1}{3} a + 2.2 - 0.2 = \\ - \frac{4 + 3}{9}a + 2 = \\ - \frac{7}{9} a + 2$

4.

$\frac{4.6}{x + 4.4} = \frac{8.4}{3x + 5.1} \\ 4.6(3x + 5.1) = 8.4(x + 4.4) \\ 13.8x + 23.46 = 8.4x + 36.96 \\ 13.8x - 8.4.x = 36.96 - 23.46 \\ 5.4x = 13.5 \\ x = 2.5$

5.

$\frac{2}{3} z = \frac{2}{9} z - \frac{7}{9} \\ 6z = 2z - 7 \\ 6z - 2z = - 7 \\ 4x = - 7 \\ x = - \frac{7}{4} \\ x = - 1 \frac{3}{4} \\ x = - 1.75$