perplexus.info :: Just Math : A repeating irrational number?

A repeating irrational number? (Posted on 2005-06-06)

Can you explain why the fourth root of 9.1 is practically the same as 33/19? You shouldn't use even a calculator!

See The Solution Submitted by e.g.

Rating: 3.1667 (6 votes)

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Puzzle Solution

Comment 8 of 8 |

11859210~11859211. This means 7x13x19^4~2x3^4x5x11^4, so 91*19^4~10*33^4, and then 9.1~33^4/19^4, and consequently: √√9.1~33/19

Edited on September 22, 2023, 10:39 am

Posted by K Sengupta on 2023-07-29 03:45:52

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