Câu hỏi của Nguyễn Ngọc Quỳnh Như

Question

^{$ChoA=1+2^2+2^3+2^4+.......+2^{2015}$}

^{Tìm x, để: $A+1=2^x$}

Minh Anh · Accepted Answer

$A=1+2^2+2^3+2^4+...+2^{2015}$

$2A=2+2^3+2^4+2^5+...+2^{2016}$

$2A-A=\left(2+2^3+2^4+2^5+...+2^{2016}\right)-\left(1+2^2+2^3+2^4+...+2^{2015}\right)$

$A=2^{2016}-1$

Câu trả lời:

$A=1+2^2+2^3+2^4+...+2^{2015}$

$2A=2+2^3+2^4+2^5+...+2^{2016}$

$2A-A=\left(2+2^3+2^4+2^5+...+2^{2016}\right)-\left(1+2^2+2^3+2^4+...+2^{2015}\right)$

$A=2^{2016}-1$

Minh Anh · Answer

Đề sai rồi

Câu trả lời:

Đề sai rồi