数列😖!万分感谢🙏🙏
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数列😖!万分感谢🙏🙏
数列😖!万分感谢🙏🙏
数列😖!万分感谢🙏🙏
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An+1=2An+(5-3)·5^n
An+1 - 5^(n+1) = 2 (An-5^n)
令Bn=An-5^n,B1=1
Bn+1 = 2Bn
Bn=B1* 2^(n-1) =2^(n-1)
An=Bn +5^n =2^(n-1)+5^n