cho 3 so a,b,c duong chung minh:
\(\frac{1}{a^2+bc}+\frac{1}{b^2+ac}+\frac{1}{c^2+ab}\le\frac{a+b+c}{2abc}\)
cho a,b,c duong va abc=1
cmr \(Q=\sqrt{\frac{a}{1+a+ab}}+\sqrt{\frac{b}{1+b+bc}}+\sqrt{\frac{c}{1+c+ca}}\le\sqrt{a+b+c}\)
Cho a,b,c là độ dài 3 cạnh của 1 tam giác . CM : \(\frac{1}{a^2+bc}+\frac{1}{b^2+ac}+\frac{1}{c^2+ab}\le\frac{a+b+c}{2abc}\)
cho ca so a,b,c duong thoa man ab+bc+ca =1 chung minh \(P=\frac{2a}{\sqrt{1+a^2}}+\frac{b}{\sqrt{1+b^2}}+\frac{c}{\sqrt{1+c^2}}\le\frac{1}{4}\)
Cho 3 số thực dương a,b,c thoả mãn a+b+=1. Chứng minh rằng \(\frac{a-bc}{a+bc}+\frac{b-ac}{b+ac}+\frac{c-ab}{c+ab}\le\frac{3}{4}\)
cho a,b,c duong,a+b+c=1.chung minh: \(\frac{ab}{c+1}+\frac{bc}{a+1}+\frac{ac}{b+1}<\frac{1}{4}\)
cho a,b,c >0 va abc=1.
CMR \(\frac{1}{ab+a+2}+\frac{1}{bc+c+2}+\frac{1}{ca+a+2}\le\frac{3}{4}\)
cho a, b, c > 0 thỏa abc=1
CM : :\(\frac{1}{\sqrt{ab+a+2}}+\frac{1}{\sqrt{bc+b+2}}+\frac{1}{\sqrt{ac+c+2}}\le\frac{3}{2}\)
cho a+b+c=1.chung minh:\(\frac{ab}{c+1}+\frac{bc}{a+1}+\frac{ac}{b+1}\le\frac{1}{4}\)