中二數題=====1/4-1/2^2 x=0
回答 (2)
2007-03-23 3:22 am
✔ 最佳答案
1/4 - 1/2^2x = 0 ---> (將1/4變成 (1/2)^2 , 再將1/2^2x 變成(1/2)^2x )(1/2)^2 - (1/2)^2x = 0 ---> (大家都有 (1/2 ) , 所以可以抽數 )
(1/2) ^ (2-2x) = 0 (抽個commom factor 出黎 , 底數相同 , 指數數相減)
2 - 2x = 0 (任何數既 0 次方都係等於 0, 所有 (1/2)^0 = 0 , 所以2 - 2x = 0 )
x = 1
hope that can help u
參考: me
2007-03-23 3:18 am
1/4 - 1/2^2 x = 0
1/4 - 1/4 x = 0
1/4 = 1/4 x
0.25 = 0.25 x (for easier calculation, I changed them into decimal numbers)
0.25/0.25 = 0.25 x/0.25
x = 1
1/4 - 1/4 x = 0
1/4 = 1/4 x
0.25 = 0.25 x (for easier calculation, I changed them into decimal numbers)
0.25/0.25 = 0.25 x/0.25
x = 1
參考: Myself
收錄日期: 2021-04-12 20:53:52
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070322000051KK03064