$ \dfrac{a^2}{b^2+c^2}+ \dfrac{b^2}{c^2+a^2}+ \dfrac{c^2}{a^2+c^2} \geq \dfrac{a}{b+c}+ \dfrac{b}{c+a} + \dfrac{c}{b+a}$
Edited by kid_glove1412, 20-08-2007 - 05:40.
Edited by kid_glove1412, 20-08-2007 - 05:40.
cho a,b,c>0 cmr
$\dfrac{ a^{2} }{b^{2} + c^{2}} +\dfrac{ b^{2} }{c^{2} + a^{2}}+\dfrac{ c^{2} }{a^{2} + b^{2}} \geq \dfrac{a}{b+c}+\dfrac{b}{a+c}+\dfrac{c}{b+a}$
Edited by quangghePT1, 19-08-2007 - 07:54.
Edited by kid_glove1412, 20-08-2007 - 05:45.
Edited by kid_glove1412, 22-08-2007 - 19:37.
mình chưa hiểu tại sao lại có:
$ \dfrac{a^2}{b^2+c^2}+ \dfrac{b^2}{c^2+a^2}+\dfrac{c^2}{a^2+b^2} \geq \dfrac{a}{b+c}+ \dfrac{b}{c+a} + \dfrac{c}{a+b} \Leftrightarrow (a^2+b^2+c^2)( \dfrac{1}{a^2}+ \dfrac{1}{b^2}+ \dfrac{1}{c^2}) \geq (a+b+c)( \dfrac{1}{a}+ \dfrac{1}{b}+ \dfrac{1}{c})$
Edited by kid_glove1412, 24-08-2007 - 15:55.
mình chưa hiểu tại sao lại có:
$ \dfrac{a^2}{b^2+c^2}+ \dfrac{b^2}{c^2+a^2}+\dfrac{c^2}{a^2+b^2} \geq \dfrac{a}{b+c}+ \dfrac{b}{c+a} + \dfrac{c}{a+b} \Leftrightarrow (a^2+b^2+c^2)( \dfrac{1}{a^2}+ \dfrac{1}{b^2}+ \dfrac{1}{c^2}) \geq (a+b+c)( \dfrac{1}{a}+ \dfrac{1}{b}+ \dfrac{1}{c})$
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