Bđt

F

fnuonehlhd

dau tien e dung bdt bunhia cho(a2+b2+c2)ta dc:3(a2+b2+c2)>=(a+b+c) binh phuong suy ra (a+b+c)<=3.dieu phai chung minh tuong duong voi:a/b+b/c+a/c>=3.e dung cóin cho 3 so la ra thui
 
Top Bottom