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anemone
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Prove that $\sqrt{8}^{\sqrt{7}}<\sqrt{7}^{\sqrt{8}}$.
anemone said:Prove that $\sqrt{8}^{\sqrt{7}}<\sqrt{7}^{\sqrt{8}}$.
anemone said:Subtle Hint:
$7\cdot 31^2<8\cdot k^2$
anemone said:Prove that $\sqrt{8}^{\sqrt{7}}<\sqrt{7}^{\sqrt{8}}$.
anemone said:Prove that $\sqrt{8}^{\sqrt{7}}<\sqrt{7}^{\sqrt{8}}$.
Albert said:let :$A=\sqrt{8}^{\sqrt{7}},\,\,B=\sqrt{7}^{\sqrt{8}}$
$A^2=8^\sqrt 7,B^2=7^\sqrt 8$
since: $8^7=2097152<7^8=5764801$
$\therefore A^2<B^2$
so the proof is done
anemone said:Thanks for participating, Albert...but...
By following your logic, if we have $4^3(=64)<3^4(=81)$, then does that mean $4^{\sqrt{3}}<3^{\sqrt{4}}$ must hold as well?
You know, the example I cited above doesn't work...
Albert said:let:$f(x)=\sqrt{\dfrac{x+1}{x}}$
$g(x)=\dfrac {log(x+1)}{log(x)}$
if $x\in N ,\,\, and \,\,x>1$
the solution of $f(x)>g(x)$,is $x\geq 7$
if $x=2,3,4,5,6 $ then $f(x)<g(x)$
Albert said:let:$f(x)=\sqrt{\dfrac{x+1}{x}}$
$g(x)=\dfrac {log(x+1)}{log(x)}$
if $x\in N ,\,\, and \,\,x>1$
the solution of $f(x)>g(x)$,is $x\geq 7$
if $x=2,3,4,5,6 $ then $f(x)<g(x)$
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