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Daca [tex] \frac{2x}{3y} = \frac{1}{2} [/tex] , calculeaza: 
 
  a)[tex] \frac{x}{y} [/tex]
   b)[tex] \frac{2x-y}{x+y} [/tex]


Răspuns :

a. 3y=4x⇒y=4x/3;
⇒a. x/y=x/4x/3=x·3/4x⇒se reduce xu cu x⇒3/4;⇒x/y=3/4;
b. 2x-4x/3/x+4x/3
⇒6x/3-4x/3/3x/3+4x/3
⇒2x/3/7x/3⇒se reduce x cu x;
⇒2/3·3/7=2/7;