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Calculati x+y/2*√xy, daca x=2/√5,y=4/√20.
dau coroana!!!!



Răspuns :

 x=2/√5             
y=4/√20=4/2√5=2/√5

(x+y)/2*√xy  ridicam la patrat
(2/√5+2/√5)/2×√(2/√5×2/√5)=
=(4/√5 )/(2×2√5)=
=(4/√5 )/(4√5)=1