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5- (4supra7-1supra14)

Răspuns :

5-(8/14-1/14)=5-7/14=5-1/2=10/2-1/2=9/2
5-(4/7-1/14)= - amplificam 4/7 cu 2

5-(8/14-1/14)=
5-7/14=
5-1/2= - amplificam 5 cu 2
10/2-1/2= 9/2
/- supra