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Puteti sa ma ajutati cu proportia derivata :
[tex] \frac{ x}{y} = \frac{2}{7} [/tex]

[tex] \frac{2x + 3y}{5 y} [/tex]
Multumesc anticipat !

Răspuns :

Emilianbuciu
Descompui fractia in [tex] \frac{2x}{5y} + \frac{3x}{5y} = \frac{2}{5} \frac{x}{y} + \frac{3}{5} \frac{x}{y} = \frac{2}{5}* \frac{2}{7} + \frac{3}{5} * \frac{2}{7}= \frac{4}{35} + \frac{6}{35} = \frac{10}{35} = \frac{2}{7} [/tex]

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