2^X-5^Y=3
2^X-3+5^5-2=21
X=?
更新1:
唔係2^X-3+5^5-2=21 係2^X-3+5^Y-2=21
簡單 容易的數學題 但我唔識計
回答 (2)
2011-01-01 10:58 pm
✔ 最佳答案
2^(X-3) + 5^(Y-2) = 212^X/2^3 + 5^Y/5^2 = 21
(25)2^X + (8)5^Y = 4200------------------------(1)
2^X-5^Y=3--------------------------------------------(2)
(2)x8 + (1), (33)2^X = 4224
2^X = 128
X = 7
參考: 請勿抄襲
2011-01-01 9:18 pm
2^x-3+5^5-2=21
=2^x-5+25=21
=2^x+20=21
=2^x=1
=x=0
2^(0)
=1
2011-01-01 13:18:45 補充：
Can it help you?
=2^x-5+25=21
=2^x+20=21
=2^x=1
=x=0
2^(0)
=1
2011-01-01 13:18:45 補充：
Can it help you?
參考: me
收錄日期: 2021-04-20 21:07:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110101000051KK00406