Well since no one got the last one, I'll just leave it up to see if anyone gets it *cough Xantar cough*

Anyhow, here is another one,
Write an expression equal to 10 that uses five 9's plus any signs of arithemtic you need.

Nobody got the last one?

I thought drolldurham's answer was accepted.

Anyway,

9 x 9
-------- + 9 = 10
9 x 9

In case the formatting gets messed up or something, that's nine times nine divided by nine and divided by nine again then added to nine.