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2x2=5


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16 - 36 = 25 - 45

 

Most adjunk mindkét oldalhoz (9/2)2 -t !

 

16 - 36 + (9/2)2 = 25 - 45 + (9/2)2

 

Vegyük észre, hogy mind két oldalon teljes négyzetet látunk !

 

[4 - (9/2)]2 = [5 - (9/2)]2

 

Vonjunk, mindkét oldalból gyököt !

 

4 - (9/2) = 5 - (9/2)

 

A baloldalon szerepel 4, amiről tudjuk, hogy 2x2

 

2x2 - (9/2) = 5 - (9/2)

 

Adjunk mindkét oldalhoz (9/2)-t !

 

2x2 = 5 ??!!

 

Ez már valami :lol:

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