math brain teaser.... are you brain enough?

[Beachbum1546]

I spent close to half hour trying to make a perfect equation but I couldn't make a good one without using one of the numbers twice. Here's the best I could do with minimizing the use of an extra number.


{[(10^2 - 6^2)/8] + 21-19} [(100^-.5)(10)]=9


only used extra 10.

 

[samoth]

I spent close to half hour trying to make a perfect equation but I couldn't make a good one without using one of the numbers twice. Here's the best I could do with minimizing the use of an extra number.


{[(10^2 - 6^2)/8] + 21-19} [(100^-.5)(10)]=9


only used extra 10.

The way he worded the problem, you can use any algebra or ring you want, define whatever sets you see fit, and use any operators necessary.

You're working entirely too hard. Math is about being as lazy as possible. Usually, knowing a solution exists is good enough. Anything past that is called "applied math".

 

[Devastation]

10 - ((21-8)/(19-6)) = 9