\(1,Cho.a,b,c\ge1.CMR:\left(a-\dfrac{1}{b}\right)\left(b-\dfrac{1}{c}\right)\left(c-\dfrac{1}{a}\right)\ge\left(a-\dfrac{1}{a}\right)\left(b-\dfrac{1}{b}\right)\left(c-\dfrac{1}{c}\right)\)
2, Cho a,b,c>0.CMR:
\(\dfrac{a+b}{bc+a^2}+\dfrac{b+c}{ac+b^2}+\dfrac{c+a}{ab+c^2}\le\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c}\)
CM BĐT: \(\dfrac{a}{b+c}+\dfrac{b}{c+a}+\dfrac{c}{a+b}\ge\dfrac{3}{2}\) với \(a,b,c>0\)
CMR: \(\dfrac{1}{\left(1+a\right)^2}+\dfrac{1}{\left(1+b\right)^2}\ge\dfrac{1}{1+ab}\forall a,b\ge0\)
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Cho 3 số nguyên dương a , b, c thỏa mãn : \(a^2+b^2+c^2=\dfrac{5}{3}\)
CM BĐT : \(\dfrac{1}{a}+\dfrac{1}{b}-\dfrac{1}{c}< \dfrac{1}{abc}\)
Cho a và b không đồng thời bằng 0
Chứng minh \(\dfrac{a^2-ab+b^2}{a^2+ab+b^2}\ge\) \(\dfrac{1}{3}\)
Cho a,b,c>0
CMR:
\(\dfrac{bc}{a^2b+a^2c}+\dfrac{ca}{ab^2+b^2c}+\dfrac{ab}{ac^2+bc^2}\text{≥}\dfrac{1}{2}\left(\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c}\right)\)
cho a, b, c >0. Chứng minh:
\(\dfrac{a}{bc}+\dfrac{b}{ac}+\dfrac{c}{ab}\ge\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c}\)
CMR:
a,\(\dfrac{a^2+b^2}{2}\ge\dfrac{\left(a+b\right)^2}{2}\)
b,Cho a+b=1,a>0,b>0 CMR:\(\left(1+\dfrac{1}{a}\right)\left(1+\dfrac{1}{b}\right)\)\(\ge9\)