BACC A  < 2B C  +A B  +A, CHO A,B,C > 0, CMR

câu 4: - DE THI HSG TOAN LOP 8 CO DAP AN
DE THI HSG TOAN LOP 8 CO DAP AN

Câu 4:

b

a

c

c a  < 2

b c  +

a b  +

a, Cho a,b,c > 0, CMR: 1 <

2

x

y

y +

x

b, Cho x,y 0 CMR: