2^(3^(x+1))-5(3^x)=9
(2^x)-(2^x-1)=4
更新1:
寫清楚D: (2^x)-(2^(x-1))=4
F.3數學2條,10點!!急
回答 (1)
2009-09-30 4:37 am
✔ 最佳答案
2(3^(x+1))-5(3^x)=92*3(3^x) - 5(3^x) = 9
6(3^x) - 5(3^x) = 9
3^x = 9
3^x = 3^2
x = 2
(2^x)-(2^(x-1))=4
(2^x) - (1/2)(2^x) = 4
(1 - 1/2)(2^x) = 4
(1/2)(2^x) = 4
2^x = 8
2^x = 2^3
x = 3
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