Question

Математика 6 клас рівняння

Answer 1

1.

$5(x - 2) = 7(x - 3)$

$5x - 7x = - 21 + 10$

$- 2x = - 11$

$x = \frac{11}{2} = 5.5$

2.

$3(x + 0.3) = 5(0.2 - x)$

$3x + 5x = 1 - 0.9$

$8x = 0.1$

$x = \frac{1}{10} \div 8 = \frac{1}{10} \times \frac{1}{8} = \frac{1}{80} = 0.0125$

3.

$7(x - 5) = 9(x + 3)$

$7x - 9x = 27 + 35$

$- 2x = 62$

$x = - 31$

4.

$5(x - 2) = 3(x + 2)$

$5x - 3x = 10 + 6$

$2x = 16$

$x = 8$

5.

$7(x - 1) = 5(x + 5)$

$7x - 5x = 25 + 7$

$2x = 32$

$x = 16$

6.

$2.4 - 0.9x = 3.2 - 0.8x + 3.5$

$- 0.9x + 0.8x = 3.2 - 2.4 + 3.5$

$- 0.1x = 4.3$

$x = - \frac{43}{10} \div \frac{1}{10}$

$x = - \frac{43 \times 10}{10 \times 1} = - 43$