M
mamy007


1)cho a,b,c >0 .thoa mãn [TEX]a^2+b^2=1[/TEX] .cm :[TEX]\frac{1}{a}+\frac{1}{b}- (\sqrt{\frac{a}{b}}-\sqrt{\frac{b}{a}})^2\geq\2sqrt{2}[/TEX]
2)cho a+b>1 chứng minh [TEX]a^4+b^4>\frac{1}{8}[/TEX]
2)cho a+b>1 chứng minh [TEX]a^4+b^4>\frac{1}{8}[/TEX]
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