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1+3/(2+1/(4+5/7))...

`1+3/(2+1/(4+5/7))`

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= `1 + 3 /{2 + 1/(4 + 5/7}`
= ` 1 + 3 / { 2 + 1/(28+5)/7}`
= ` 1 + 3 / { 2 + 1/(33)/7 }`
=` 1 + 3 / { 2 + 7 /(33)}`
= ` 1 + 3 / { (66+7)/(33)}`
= ` 1 + 3 / (73) / (33)`
=`1 + (3 xx 33)/(73) `
= ` 1 + (99)/(73) `
...
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