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A apartine multimii Q. Pentu a calcula 2/3 din 1/a putem calcula 1/2a + 1/6a ?

Răspuns :

-2a+1/6a=1; amplificam cu 6a:  -12a+1=6a; -12a-6a=-1; -18a=-1; a=1/18; 2/3*1/1/18= 2/3*18=36/3=12