Just trying to enter a complex fraction with no luck

Questions
,
1

Wolfram Alpha Pro isn’t recognizing it

like 10      + 11
            11-x x-11
       --------------------------------
3         + 8
            x x-11

or
5m^6n^3
           4
_______

3m^2n^7

7n^3

2

Maybe this is cheating, but you can first evaluate the expressions using Mathematica.

3

http://www.wolframalpha.com/input/?i=%2810%2F%2811-x%29%2B11%2F%28x-11%29%29%2F%283%2Fx%2B8%2F%28x-11%29%29

(10/(11-x)+11/(x-11))/(3/x+8/(x-11))
4

Thanks Bill, I tried every combination of brackets but those, thx again.