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Răspuns :

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Vezi imaginea AURAS28888
2 1/2=5/2
3 1/4=13/4
1 1/5=6/5
5/2:(5/2-13/4*4/13)*6/5
13/4*4/13=1
5/2:(5/2-1)*6/5
5/2:3/2*6/5
5/2:3/2=5/2*2/3=5/3
5/3*6/5=30/15=2