215. Теңдеуді шешіңдер: 1) x/1,21 = 5/242; 2) 16,9/y = 13/10.

1)

\[\frac{x}{1,21}=\frac{5}{242}\]

\[x=1,21\cdot\frac{5}{242}=\frac{121}{100}\cdot\frac{5}{242}=\frac{1}{200}\cdot5=\frac{1}{40}=0,025.\]

2)

\[\frac{16,9}{y}=\frac{13}{10}\]

Айқыш көбейту:

\(16,9\cdot10=13y\).

\[y=\frac{16,9\cdot10}{13}=\frac{169}{13}=13.\]

Жауап: 1) \(x=0,025\); 2) \(y=13\).