Explicație pas cu pas:
[tex] \frac{0.4}{5.2} = \frac{x}{1 \frac{4}{5} } \\ \frac{ \frac{40}{10} }{ \frac{52}{10} } = \frac{x}{ \frac{1 \times 5 + 4}{5} } = \\ \frac{40}{10} \div \frac{52}{10} = x \div \frac{9}{5} = \\ \frac{40}{10} \times \frac{10}{52} = x \times \frac{5}{9} \\ \frac{400}{520} = \frac{5x}{9} \\ \frac{10}{13} = \frac{5x}{9 } \\ \frac{90}{117} = \frac{65x}{117} \\ 65x = 90 \\ x = \frac{18}{13} [/tex]
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