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Fie numerele x=3√5-4 si y=7-2√5 .Calculati x+y , x-y, x*y si x supra y

Răspuns :

x+y=√41+√69    
x+y=√110

x-y=√41-√69
x-y=-√28

x*y=√41*√69
x*y=√2829