T
thuthuatna



cho tui hoi cai:
Bai 1)chung minh rang: 4/(a+b)^3+4/(b+c)^3+4/(c+a)^3 lon hon hoac bang a/(b+c)+b/(a+c)+c/(a+b)
Bai 2)giai phuong trinh nghiem nguyen: x^3+xy^2+x^2y+y^3=4(x^2+y^2+xy+3)
Ai giai duoc 2 bai nay coi nhu thien tai tui xin cam on truoc
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