點計呢條數ar??
5^x+1=100+5^x
點計呢條數ar??(10分)
2006-11-14 2:06 am
回答 (3)
2006-11-14 2:15 am
✔ 最佳答案
指數方程 (exponential equation)5x+1 = 100+5x
5x‧51 = 100+5x
5(5x)﹣5x = 100
(5﹣1)5x = 100
4(5x) = 100
5x = 100 / 4
5x = 25
5x = 52
x = 2
註：「‧」符號等於乘
2006-11-13 18:26:35 補充：
↓左方4(5x)中的4，因為是乘，故可以將它調向右方，乘變除。4(5x) = 1005x = 100 / 4
2006-11-13 18:27:33 補充：
將同類項放在一邊，非同類項放在另一邊
參考: 中四級數學書
2006-11-14 2:30 am
5^(x + 1) = 100 + 5^x
5^x ．5^1 = 100 + 5^x
5(5^x) = 100 + 5^x
4(5^x) = 100
5^x = 25
5^x = 5^2
x = 2
5^x ．5^1 = 100 + 5^x
5(5^x) = 100 + 5^x
4(5^x) = 100
5^x = 25
5^x = 5^2
x = 2
2006-11-14 2:17 am
你既問題係咪咁
5^(x + 1) = 100 + 5^x
5^x ．5^1 = 100 + 5^x
5(5^x) = 100 + 5^x
4(5^x) = 100
5^x = 25
5^x = 5^2
x = 2
5^(x + 1) = 100 + 5^x
5^x ．5^1 = 100 + 5^x
5(5^x) = 100 + 5^x
4(5^x) = 100
5^x = 25
5^x = 5^2
x = 2
收錄日期: 2021-04-12 21:28:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061113000051KK02777