6)
Rationalise
denominator's
5 by root3-root5
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=5/Г3-Г5
5
--------------×Г3+Г5
-----------------
Г3-Г5 Г3+Г5
5(Г3+Г5) (a+b)(a-b)=a2-b2
----------------------
(Г3)2-(Г5)2
Г15+Г25
---------------------
3-5
-Г15+5
-----------------
2
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