請幫幫我吧
1) (-2x-3)^2?
2) (x-3)^2?
3) (4x+5)^2?
謝謝
maths
2007-08-02 3:29 am
回答 (1)
2007-08-02 3:34 am
✔ 最佳答案
根據公式: ( a + b )^2 = a^2 + 2ab + b^2,( 1 ) ( - 2x - 3 )^2
= ( 2x + 3 )^2
= 4x^2 + 12x + 9
( 2 ) ( x - 3 )^2
= x^2 - 6x + 9
( 3 ) ( 4x + 5 )^2
= 16x^2 + 40x + 25
參考: My Maths Knowledge
收錄日期: 2021-04-13 00:55:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070801000051KK05015