1. 2 ( p + q )^2 - 6 ( p + q )^3
2. ( a - 2b)^2 + ( 2a - b )( 2b - a )
3. 2 ( x + y - 1 )^2 - 4 ( 1 - x - y)
4. 18 ( 2a - 3b )^2 - 6 ( 3b - 2a)
收錄日期: 2021-04-23 18:51:43
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061228000051KK01178