

1,Cho a;b;c>0; ab+bc+ca=abc
CMR
a+bca2+b+acb2+c+abc2≥4a+b+c
2,Cho x≥2;x+y≥3
Tìm GTNN S= x2+y2+x1+x+y1
3,Cho x;y>0 x+y=1 tìm minP
P= 20(x3y+xy3)+xy2+2017
CMR
a+bca2+b+acb2+c+abc2≥4a+b+c
2,Cho x≥2;x+y≥3
Tìm GTNN S= x2+y2+x1+x+y1
3,Cho x;y>0 x+y=1 tìm minP
P= 20(x3y+xy3)+xy2+2017