請幫幫手..我唔識做呢條數....
1) 6 ge 2x+3次方 – 36 ge x+1次方 = 30
2) 4 / 2 ge x+1次方 X 3 ge x+1次方 = 3 ge -2次方
次方數學題
2008-10-20 5:23 am
回答 (1)
2008-10-24 6:10 am
✔ 最佳答案
6^(2x+3) –36^(x+1) = 306^(2x+3) –6^(2x+2) = 30
[6^(2x+3)][1- 6^(-1)] = 30 [ 抽common factor 6^(2x+3) ]
6^(2x+3) = 6^2
Hence 2x+3 = 2
x= -(1/2)
= -0.5
我想問...第2題係
<4/[2^(x+1)]>[3^(x+1)] = 3^(-2)
定係
[(4/2)^(x+1)][3^(x+1)] = 3^(-2) 呀???
收錄日期: 2021-04-13 16:10:27
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081019000051KK02656