Mathematica 9 is now available
Student Support Forum
-----
Student Support Forum > General > > "a question about substitution"

Post Reply:
Name:
Email Address:

Please send email when my message is replied to.

Url (optional):
Subject:
Message: view original message?
Attachment (optional):
Please answer this:1+1 =



Original Message (ID '125167') By reply:
In Response To 'Re: a question about substitution' --------- Thank you for your attention, but my question is that the first element of x is correct and the second is not true (through the deduction by hand), and how I correctly pick out the right one