我想知個詳細部x (唔識打) +答案
1. -20ay(2次)+2a(2次)bc+4abcy-10a(2次)y
2. 32a(2次)b-2b(3次)
3. -a(2次)b(2次)+c(2次)
有幾題maths問題唔係好識,請教下(20分)
2008-08-18 10:11 pm
回答 (1)
2008-08-18 10:22 pm
✔ 最佳答案
Q1.-20ay^2 + 2a^2bc + 4abcy - 10a^2y = -10ay(2y + a) + 2abc(a + 2y)
= (a + 2y)(2abc - 10ay) = 2a(a + 2y)(bc - 5y).
Q2.
32a^2b - 2b^3 = 2b(16a^2 - b^2) = 2b[(4a)^2 - b^2] = 2b(4a + b)(4a - b).
Q3.
-a^2b^2 + c^2 = c^2 - (ab)^2 = (c + ab)(c - ab).
收錄日期: 2021-04-25 22:38:32
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https://hk.answers.yahoo.com/question/index?qid=20080818000051KK01558