(x^2-y^2)+7(x^2+2xy+y^2)
更新1:
(x-1)^2-5(x-1)-24
更新2:
展開(7-a)(a^2+7a+49)
更新3:
-16s^2+24s-9
因式分解問題 (5分)
回答 (4)
2006-10-28 8:04 pm
✔ 最佳答案
(x^2-y^2)+7(x^2+2xy+y^2)= x^2 - y^2 + 7x^2 + 14xy + 7y^2
= 8x^2 + 14xy +6y^2
= 2(4x^2 + 7xy +3y^2)
= 2(4x+3y)(x+y)
2006-10-28 12:08:43 補充：
會有個更快的方法:(x^2-y^2)+7(x^2+2xy+y^2) = (x+y)(x-y) + 7(x+y)^2= (x+y) [x-y+ 7(x+y)]= (x+y)(x-y+7x+7y)= (x+y)(8x+6y)= 2(x+y)(4x+3y)
2006-10-28 8:22 pm
(x^2-y^2)+7(x^2+2xy+y^2)
= x^2 - y^2 + 7x^2 + 14xy + 7y^2
= 8x^2 + 14xy +6y^2
= 2(4x^2 + 7xy +3y^2)
= 2(4x+3y)(x+y)
會有個更快的方法:
(x^2-y^2)+7(x^2+2xy+y^2)
= (x+y)(x-y) + 7(x+y)^2
= (x+y) [x-y+ 7(x+y)]
= (x+y)(x-y+7x+7y)
= (x+y)(8x+6y)
= 2(x+y)(4x+3y)
希望幫到你 求你選我最佳答案
求下你
唔該!!!!!!
唔該!!!!!!
= x^2 - y^2 + 7x^2 + 14xy + 7y^2
= 8x^2 + 14xy +6y^2
= 2(4x^2 + 7xy +3y^2)
= 2(4x+3y)(x+y)
會有個更快的方法:
(x^2-y^2)+7(x^2+2xy+y^2)
= (x+y)(x-y) + 7(x+y)^2
= (x+y) [x-y+ 7(x+y)]
= (x+y)(x-y+7x+7y)
= (x+y)(8x+6y)
= 2(x+y)(4x+3y)
希望幫到你 求你選我最佳答案
求下你
唔該!!!!!!
唔該!!!!!!
參考: me
2006-10-28 8:08 pm
Ans:
Method 1:
= x^2 - y^2 + 7x^2 + 14xy + 7y^2
= 8x^2 + 14xy + 6y^2
= 2(4x^2 + 7xy + 3y^2)
= 2(x + y) (4x + 3y)
Method 2:
= (x + y)(x - y) + 7(x + y)^2
= (x + y) [(x - y) + 7(x + y)]
= (x + y) (x - y + 7x + 7y)
= (x + y) (8x + 6y)
= 2 (x + y) (4x + 3y)
Method 1:
= x^2 - y^2 + 7x^2 + 14xy + 7y^2
= 8x^2 + 14xy + 6y^2
= 2(4x^2 + 7xy + 3y^2)
= 2(x + y) (4x + 3y)
Method 2:
= (x + y)(x - y) + 7(x + y)^2
= (x + y) [(x - y) + 7(x + y)]
= (x + y) (x - y + 7x + 7y)
= (x + y) (8x + 6y)
= 2 (x + y) (4x + 3y)
2006-10-28 8:04 pm
(x^2-y^2)+7(x^2+2xy+y^2)
=x^2-^2+7x^2+14xy+7y^2
=8x^2+14xy+6x^2
=(8x+6y)(x+y)
=做完
=x^2-^2+7x^2+14xy+7y^2
=8x^2+14xy+6x^2
=(8x+6y)(x+y)
=做完
收錄日期: 2021-04-29 23:52:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061028000051KK01448