Question

решите уравнения 6 класс​

Answer 1

$6 \div 5 = x \div 7.5 \\ 6 \times 7.5 = 5 \times x \\ 45 = 5x \\ 5x = 45 \\ x = 9$

$a \div 1 \frac{7}{50} = \frac{5}{57} \div \frac{1}{2} \\ \frac{a}{1 \frac{7}{50} } = \frac{ \frac{5}{57} }{ \frac{1}{2} } \\ \frac{a}{ \frac{57}{50} } = \frac{10}{57} \\ \frac{50a}{57} = \frac{10}{57} \\ 50a = 10 \\ a = \frac{1}{5}$

$\frac{x}{0.8} = \frac{15}{4} \\ \frac{x}{ \frac{4}{5} } = \frac{15}{4} \\ \frac{5x}{4} = \frac{15}{4} \\ 5x = 15 \\ x = 3$

$\frac{5 - y}{4} = \frac{3}{7} \\ 7(5 - y) = 4 \times 3 \\ 35 - 7y = 12 \\ - 7y = 12 - 35 \\ - 7y = - 23 \\ y = \frac{23}{7} \\ y = 3 \frac{2}{7}$