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.
对角矩阵 {{ a, 0 }, {0, b }} 何时可逆?(答: ab != 0 。)
对角矩阵 {{ a, 0 }, {0, b }} 何时可逆?(答: ab != 0 。)
Natural Language
Math Input
Extended Keyboard