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49xla a 2=(radical din5+1) la 2

Răspuns :

49x²=(√5+1)²
49x²=5+2√5+1
49x²=6+2√5
49x²=2(3+√5)
x²=[2(3+√5)]/49
x=±√[2(3+√5)]/49
x=±√[2(3+√5)]/√49
x=±√[2(3+√5)]/7