化簡下列各式:
7xy-3+8x+9xy-12xy+7x
5s2(2次方)-4-3s2(2次方)+2
傻仔再發問,數學問題!
2007-09-04 1:40 am
回答 (3)
2007-09-04 1:42 am
✔ 最佳答案
7xy-3+8x+9xy-12xy+7x=7xy-12xy+9xy-8x+7x-3
=4xy-x-3//
5s^2-4-3s^2+2
=5s^2-3s^2-4+2
=2s^2-2
=2(s^2-1)
=s(s-1)(+1)//
2007-09-03 19:20:39 補充：
5s^2-4-3s^2+2=5s^2-3s^2-4+2=2s^2-2=2(s^2-1)=2(s-1)(+1)//
2007-09-04 2:18 am
7xy-3+8x+9xy-12xy+7x
=7xy+9xy-12xy+8x+7x-3
=4xy+15x-3#
5s^2-4-3s^2+2
=2s^2-2
=2(s^2-1)
=2(s+1)(s-1)#
=7xy+9xy-12xy+8x+7x-3
=4xy+15x-3#
5s^2-4-3s^2+2
=2s^2-2
=2(s^2-1)
=2(s+1)(s-1)#
收錄日期: 2021-04-29 21:46:03
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070903000051KK02838