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Dacă [tex] \frac{x}{3} = \frac{5}{y} [/tex]calculează 4xy-15​

Răspuns :

[tex]\frac{x}{3} = \frac{5}{y}[/tex]

[tex]xy = 3 \times 5 = 15[/tex]

[tex]4xy - 15 = 4 \times 15 - 15 = 60 - 15 = 45[/tex]

[tex]\it \dfrac{x}{3}=\dfrac{5}{y} \Rightarrow xy=15|_{\cdot4} \Rightarrow 4xy=60|_{-15} \Rightarrow4xy-15=45[/tex]