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la punctul c va rog repede.​

La Punctul C Va Rog Repede class=

Răspuns :

2/5+[2/5+(2/5-x)]=3/5+1/5
2/5+[2/5+(2/5-x)]=4/5
2/5+(2/5-x)=4/5-2/5
2/5+(2/5-x)=2/5
2/5-x=0
x=2/5