10 - 9 %2B 8 - 7 %2B 6 - 5 %2B 4 - 3 %2B 2 - 1

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.