Fraction in fraction in fraction ............

Algebra Level 3

solve it :)


The answer is 0.62.

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6 solutions

This can be written as 1 1 + x = x x 2 + x 1 = 0 x = 1 ± 5 2 \dfrac{1}{1 + x} = x \Longrightarrow x^{2} + x - 1 = 0 \Longrightarrow x = \dfrac{-1 \pm \sqrt{5}}{2} .

Clearly x > 0 x \gt 0 , so x = 5 1 2 = 0.62 x = \dfrac{\sqrt{5} - 1}{2} = \boxed{0.62} to 2 2 decimal places.

Perfect solution...I also have solved this problem using this method...for infinite series this method(supposing the result as x) is very useful.

Muhammad Mahdi Shahriar Sakib - 6 years, 7 months ago

I just recognized it as phi

Avi Kav - 6 years, 6 months ago

same solution :)

Paul Ryan Longhas - 6 years, 7 months ago

Plz illustrate 1st step

Muhammad Faizan - 6 years, 6 months ago

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x x is the exact same as the one in the second layer because the number of layers between both x x s are the same due to the fraction having infinite layers.

Julian Poon - 6 years, 6 months ago
Didarul Alam
Nov 20, 2014

for(int i=0;i<10;i++) { x= 1/(1+x); }

cout<<x;

i did it vai programming

Goutham Injamuri
Nov 21, 2014

The given expression can be written as : 1 1 + x \frac{1}{1+x} because , if you remove one element from an infinite set of things, that won't change the infinity much. So here we assume the things after the number 1 in the denominator to be x again(by virtue of above property ).

Rest solution: 1 1 + x = x \frac{1}{1+x} =x 1=(\x^{2}) +x So, \x = 1 + 5 0.5 2 \x=\frac{-1+5^{0.5}}{2} since\ (\sqrt{5}=2.23) \x = 1 + 2.23 2 \x=\frac{-1+2.23}{2} \x = 0.618 \x=0.618

Rohan Shah
Nov 21, 2014

https://www.xtremepapers.com/community/attachments/sat-work-png.49171/

Anna Anant
Nov 20, 2014

x = 1/(1+x) x = (sqrt 5 - 1)/2 = 0.618, x = - (sqrt 5 + 1)/2 = -1.618 x = 0.62 or x = -1.62

Rudresh Tomar
Nov 13, 2014

s i m p l y 5 1 2 simply\quad \frac { \sqrt { 5 } -1 }{ 2 }

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