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3 tháng 12 2018
Câu a mình ko bt trình bày thông cảm
b) \(^{2^x.\left(2^2\right)^2=\left(2^3\right)^2}\)
\(2^x.2^4=2^6\)
\(2^x=2^6:2^4\)
\(2^x=2^2\)
\(x=2\)
TT
3
TD
2
CL
19 tháng 10 2020
2x+2x+1+2x+2+2x+3-480=0
2x+2x.2+2x.22+2x.23=0+480
2x.(1+2+22+23)=480
2x.(1+2+4+8)=480
2x.15=480
2x=480:15
2x=32=25
Vậy x =5
19 tháng 10 2020
\(2^x+2^{x+1}+2^{x+2}+2^{x+3}-480=0\)
\(2^x+2^{x+1}+2^{x+2}+2^{x+3}=480\)
\(2^x.\left(1+2^1+2^2+2^3\right)=480\)
\(2^x.\left(1+2+4+8\right)=480\)
\(2^x.15=480\)
\(2^x=480:15\)
\(2^x=32\)
\(2^x=2^5\)
\(\Leftrightarrow x=5\)
Vậy x=5
Chúc bạn học tốt
TC
28 tháng 8 2019
Ko ghi đề
\(2A=2+2^2+...+2^{101}\\ 2A-A=2^{101}-1\\ =>A=2^{101}-1\)
Mấy cái khác cg lm như v (b thì 3b)
Nhớ đúng mk nhá
16 tháng 3 2019
\(\left(4+2^2+2^3+2^4+...+2^{10}\right)x=2^{22}-2^{21}\)
\(\Rightarrow\left(2^2+2^2+2^3+...+2^{10}\right)x=2^{21}\left(2-1\right)\)
\(\Rightarrow2^{20}.x=2^{21}\) (Vì \(2^2+2^2=2^3\))
\(\Rightarrow x=2\)
Vậy x=2
14 tháng 10 2018
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