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.
無限 PG の和: a_1 = 4 、 q = -2/3 。結果。
無限 PG の和: a_1 = 4 、 q = -2/3 。結果。
Natural Language
Math Input
Extended Keyboard
