有數學唔識做??

2007-07-26 9:42 am
化簡
1.(3b)(5b4次方)
2.(a3次方 b2次方) (a3次方 b4次方)
3.(35c6次方)除(7c)
4.(24x8次方 y11次方)除(-3x4次方y3次方)
要有過程

回答 (2)

2007-07-26 10:02 pm
✔ 最佳答案
指數相乘時, 只需要將指數直接相加就 ok
eg. A^2 * A^3
= A^(2+3) = A^5
如果係除, 就將指數相減
eg. A^6 / A^3
= A^(6-3) = A^3

1)
(3b)(5b^4)
= 15b^(1+4)
= 15b^5

2)
樓上係個計法係錯架, 留意兩個括號入面既數係相乘而唔係相加
所以指數相乘時, 只需要將指數直接相加就 ok
(a^3 b^2) (a^3 b^4)
= a^(3+3) b^(3+3)
= a^6 b^6

3)
(35c6次方)/(7c)
= (35/7) c^(6-1)
= 5c^5

4)
(24 x^8 y^11)/(-3 x^4 y^3)
= (24/-3) x^(8-4) y^(11-3)
= -8 x^4 y^8

2007-07-26 14:04:14 補充:
sorry, 第二題打錯左, 應該係(a^3 b^2) (a^3 b^4)= a^(3 3) b^(2 4)= a^6 b^6
2007-07-26 10:07 am
1.(3b)(5b^4)
= 15b^5

2.(a^3b^2) (a^3 b^4)
= a^6 +a^3b^4 + a^3b^2 + b^6

3.35c^6 / 7c = 5(c^5)

4.24x^8(y^11) / -3x^4(y^3)
= -8x^(8-4)y^(11-3)
= -8(x^4)(y^8)

p.s ^ = 次方


收錄日期: 2021-04-13 00:52:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070726000051KK00366

檢視 Wayback Machine 備份