Question

tìm x biết 2^2x-1 +6.2⁸ =14. 2⁸

Answer 1

\(2^{2x-1}+6.2^8=14.2^8\)

\(2^{2x}:2+1536=3584\)

\(4^x:2=3584-1536=2048\)

\(4^x=2048:2=1024\)

\(4^x=4^5\Rightarrow x=5\)

Answer 2

nhoc quay pha lại sai nữa rồi ngu thiệt

Answer 3

\(\Leftrightarrow2^{2x-1}+6.2^8=\frac{2^{2x}+3072}{2}\)

\(\Rightarrow\frac{2^{2x}+3072}{2}=2^9.7\)

\(\Leftrightarrow2^{2x-1}+1536=3584\)

<=>2^x-1=2048

=>x=6