(A+2)y+(A-B) is identity equals to 2y+5
Then, A=? b=?
Expand:
(x+a)(x-a)(x square + a square)
(7分之a 減 b分之5)2次方
Maths
2007-10-03 12:16 am
回答 (1)
2007-10-03 12:32 am
✔ 最佳答案
Comparing CoefficientsA+2=2
A=0
A-B=5
B=-5
(x+a)(x-a)(x^2+a^2)
=(x^2-a^2)(x^2+a^2)
=x^4-a^4
(a/7-5/b)^2
=(a^2)/49-10a/7b+25/b^2
收錄日期: 2021-04-13 13:43:14
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https://hk.answers.yahoo.com/question/index?qid=20071002000051KK01618