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Daca 3a/5b = 1/2 , calculati 2a + 3b/ 8a-4b.


Răspuns :

3a/5b = 1/2⇒a=5b/6
2a + 3b/ 8a-4b=(2*5b/6+3b)/(8*5b/6-4b)=5b+9b/20b+12b=14b/8b=14/8=7/4