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.
计算 {{ 2, -1 }, {3, 4 }} {{ 1, 0 }, {-1, 2 }} 。
计算 {{ 2, -1 }, {3, 4 }} {{ 1, 0 }, {-1, 2 }} 。
Natural Language
Math Input
Extended Keyboard
