點解3^2x2^2=6^2既?
唔係應該咁架咩?
3^2x2^2
=6^2+2
=6^4
學次方既祕訣呢?除左個4個low of indices...有咩可以令得自己對次方更加熟識?
老師已經叫我地做好多關於次方既題目...但係我都係唔係好熟!!
幫幫我呀!!
次方問題+祕訣
2008-09-20 7:10 am
回答 (2)
2008-09-20 7:26 am
✔ 最佳答案
你條數錯左1
如果你方程式醒D可以 以下記
A^b x C^b
=(AxC)^b 拿^b 出來
2
兩個數共同擁有同一個A
可以拿A出
3
唔好當次數(^b)係一般數+-*/
參考: 自己
2008-09-20 7:55 am
唔岩
因為:
3^2x2^2係(3x2)^2
點解呢?
因為:
3^2x2^2
=3x3x2x2
=(3x2)(3x2)
=(3x2)^2
m^yxn^y
=(mn)^y
冇架
不過你可以不斷做[要expansion拆解(易明好多)]
次方的law
m^yxm^y
=m^(y+y)
(m^y)^x
=m^(xy)
m^y/m^x
=m^(y-x)
m^yxn^y
=(mn)^y
開方(m^y)
=m^(y/2)
m^y/n^y
=m^yn^-y
m^-y
=1/m^y
m^y
=1/m^-y
1/(m^y)
=m^-y
點解?
因為2^-2
=1/2^2
=1/4
2^2 1/(1/4)
=2^2/1 =1x4/1
=1/2^-2 =4
=1/2^-2 =2^2
=1/(1/4)
..............
重有1d
2008-09-19 23:59:22 補充：
2^2
=2^2/1
=1/2^-2
=1/2^-2
=1/(1/4)
=1x4/1
=4
=2^2
因為:
3^2x2^2係(3x2)^2
點解呢?
因為:
3^2x2^2
=3x3x2x2
=(3x2)(3x2)
=(3x2)^2
m^yxn^y
=(mn)^y
冇架
不過你可以不斷做[要expansion拆解(易明好多)]
次方的law
m^yxm^y
=m^(y+y)
(m^y)^x
=m^(xy)
m^y/m^x
=m^(y-x)
m^yxn^y
=(mn)^y
開方(m^y)
=m^(y/2)
m^y/n^y
=m^yn^-y
m^-y
=1/m^y
m^y
=1/m^-y
1/(m^y)
=m^-y
點解?
因為2^-2
=1/2^2
=1/4
2^2 1/(1/4)
=2^2/1 =1x4/1
=1/2^-2 =4
=1/2^-2 =2^2
=1/(1/4)
..............
重有1d
2008-09-19 23:59:22 補充：
2^2
=2^2/1
=1/2^-2
=1/2^-2
=1/(1/4)
=1x4/1
=4
=2^2
參考: 我,你可以上net 找d law
收錄日期: 2021-04-13 16:05:21
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080919000051KK02044