N
nhomai190407


Cho3.số.dương.a,b,c.thoả.mãn(a+b)(a+c)=1.Chứng.minh.rằng:[[tex] a(ab+bc+ca)\leq\frac{2\sqrt{3}}{9}[/tex]
Tham khảo : http://diendan.hocmai.vn/showthread.php?t=4917
Tham khảo : http://diendan.hocmai.vn/showthread.php?t=4917
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