cho a+b+c+ab+ac+bc+6
tim gia tri nho nhat cua (a^3)/b+(b^3)/c+(c^3)/a
tim gia tri max va min cua a√a+b√b voi √a+√b=√2
cho ab +ba +ac =3abc tim gia tri lon nhat 1/a^2+1 +1/b^2+1 +1/c^2+1
Cho cac so a, b, c thoa man a2 +b2+c2( <=) 2 .Tim gia tri nho nhat cua bieu thuc S=2015ca-ab-bc
tim gia tri nho nhat cua \(\sqrt{a^2+ab+b^2}+\sqrt{b^2+bc+c^2}+\sqrt{c^2+ac+a^2}\)voi a+b+c=1
tim gia tri nho nhat cua \(\sqrt{a^2+ab+b^2}+\sqrt{b^2+bc+c^2}+\sqrt{c^2+ac+a^2}\) voi a+b+c=1
voi a,b,x >0. tim gia tri nho nhat cua Q=(x+a)(x+b)/x
cho a,b la cac so duong thoa man : a+b=1
Tim gia tri nho nhat cua bieu thuc: T= \(\frac{19}{ab}+\frac{6}{a^2+b^2}+2011\left(a^4+b^4\right)\)
cho a>0;b>0va a+b\(\le\)\(4\)
tim gia tri nho nhat cua bieu thuc:A=\(\frac{2}{a^2+b^2}+\frac{35}{ab}+2ab\)