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aflati numarul necunoscut:

Aflati Numarul Necunoscut class=

Răspuns :

a)x=7/4-3/4=4/4 b)7/5-5/5=2/5

3/4+x=7/4
x=7/4-3/4
x=4/4
x=1

5/5+x=7/5
x=7/5-5/5
x=2/
x=0.4