Question

Решите уравнения ! 1) -0,2х=-0,3
2) -0,6х=-0,;
3) 7/8х=21
4) -2х=0,8
5) 2,5у=-10
6) -1,2у=0,6

Answer 1

Объяснение:

$1) \: - 0.2x = - 0.3 \\ x = - 0.3 \div - 0.2 \\ x = - \frac{3}{10} \div - \frac{2}{10} \\x = \frac{3}{10} \times \frac{10}{2} \\ x = \frac{3}{2} = 1.5 \\ 3) \: \frac{7}{8} x = 21 \\ x = \frac{21}{1} \div \frac{7}{8} \\ x = \frac{21}{1} \times \frac{8}{7} \\ x = 24 \\ 4) - 2x = 0.8 \\ x = 0.8 \div - 2 \\ x = \frac{8}{10} \div - \frac{2}{1} \\ x = \frac{8}{10} \times - \frac{1}{2} \\ x = \frac{4}{10} = 0.4 \\ 5) \: 2.5y = - 10 \\ y = - 10 \div 2.5 \\ y = - \frac{10}{1} \div \frac{25}{10} \\ - \frac{10}{1} \times \frac{10}{25} \\ x = - 4 \\ 6) - 1.2y = 0.6 \\ x = 0.6 \div - 1.2 \\ x = \frac{6}{10} \div - \frac{12}{10} \\ x = \frac{6}{10} \times - \frac{10}{12} \\ x = - 0.5$