Răspunsuri

2014-03-16T22:22:37+02:00
\dfrac xy=\dfrac{3125}{10000}\cdot\dfrac 65=\dfrac38\Rightarrow x=\dfrac{3y}{8}

In locuim aceasta valoare in fractia pe care trebuie sa o calculam

\dfrac{19x-7y}{5x+3y}=\dfrac{19\cdot\dfrac{3y}{8}-7y}{5\cdot\dfrac{3y}{8}+3y}=\dfrac{57y-56y}{15y+24y}=\dfrac{1}{39}
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