Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
inv {{1,1,1}, {1,3,5}, {1,3,10}}*{{50},{100},{20}}
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random