Factize:
1.c²-4x²+28xy-49y²
2.25(2m-n)²-(4m+3n)²
問2題數學題!!
2006-12-07 2:32 am
回答 (2)
2006-12-07 2:49 am
✔ 最佳答案
1. c²-4x²+28xy-49y²=c²-(4x²-28xy+49y²)
=c²-(2x-7y)²
=[c²+(2x-7y)] [c²-(2x-7y)]
=(c+2x-7y)(c²-2x+7y)
2. 25(2m-n)²-(4m+3n)²
=[5(2m-n)+(4m+3n)] [5(2m-n) -(4m+3n)]
=(10m-5n+4m+3n) (10m-5n-4m-3n)
=(14m-2n) (6m-8n)
=2(7m-n) * 2(3m-4n)
=4(7m-n) (3m-4n)
參考: me
2006-12-07 3:55 am
1.c²-4x²+28xy-49y²
2.25(2m-n)²-(4m+3n)²
I can help you woo.....
1) c²-4x²+28xy-49y²
=c²-(4x²-28xy+49y²)
=c²-(2x-7y)²
=[c²+(2x-7y)] [c²-(2x-7y)]
=(c+2x-7y)(c²-2x+7y)
2) 25(2m-n)²-(4m+3n)²
=[5(2m-n)+(4m+3n)] [5(2m-n) -(4m+3n)]
=(10m-5n+4m+3n) (10m-5n-4m-3n)
=(14m-2n) (6m-8n)
=2(7m-n) * 2(3m-4n)
=4(7m-n) (3m-4n)
THE END!!!!!
2.25(2m-n)²-(4m+3n)²
I can help you woo.....
1) c²-4x²+28xy-49y²
=c²-(4x²-28xy+49y²)
=c²-(2x-7y)²
=[c²+(2x-7y)] [c²-(2x-7y)]
=(c+2x-7y)(c²-2x+7y)
2) 25(2m-n)²-(4m+3n)²
=[5(2m-n)+(4m+3n)] [5(2m-n) -(4m+3n)]
=(10m-5n+4m+3n) (10m-5n-4m-3n)
=(14m-2n) (6m-8n)
=2(7m-n) * 2(3m-4n)
=4(7m-n) (3m-4n)
THE END!!!!!
參考: Me
收錄日期: 2021-04-12 22:32:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061206000051KK02935