√5+2√5-(3√5+4√5)+5√5 cat face

Răspuns :

Răspuns:

V5+2V5-(3V5+4V5)+5V5=

3V5-7V5+5V5=

-4V5+5V5=

V5

3rad5-(7rad5)+5rad5=3rad5-7rad5+5rad5=

=-4rad5+5rad5=rad5