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rezolvarea completa a ex.21. (cl11real,progresie geometrica)

Rezolvarea Completa A Ex21 Cl11realprogresie Geometrica class=

Răspuns :

b1, b2=b1+1,b3=b1+2-lun triunghiului
b2=rad(b1*b3)
b1+1=rad(b1*(b1+2))=rad(b1^2+2b1)
(b1+1)^2=b1^2+2b1
b1^2+2b1+1-b1^2-2b1=0
1=o