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.
1 - 1/2 + 1/4 - 1/8 + ... (série com alternância de sinal)
1 - 1/2 + 1/4 - 1/8 + ... (série com alternância de sinal)
Natural Language
Math Input
Extended Keyboard
