a) 4 < hoặc bằng 2 mũ x < 32
Tìm các số tự nhiên x, biết :
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
K
1
Những câu hỏi liên quan
TA
1
5 tháng 1 2018
\(128^4=\left(2^7\right)^4=2^{28}=\left(2^5\right)^{5,6}=32^{5,6}\)
theo đề ta có
\(32^x< 128^4=32^{5,6}\Rightarrow x\in\left\{1;2;3;4;5\right\}\)
TH
3
AK
9 tháng 4 2018
Ta có :
\(1-80\%\le\frac{x}{100}< 2\%+\frac{1}{4}\)
\(\Rightarrow1-\frac{80}{100}\le\frac{x}{100}< \frac{2}{100}+\frac{25}{100}\)
\(\Rightarrow\frac{20}{100}\le\frac{x}{100}< \frac{27}{100}\)
\(\Rightarrow20\le x< 27\)
\(\Rightarrow x=\left\{20;21;...;26\right\}\)
Chúc bạn học tốt !!!
27 tháng 10 2018
a.
Ta có: x thuộc B(8) và x \(\le\)30
=> \(x\in\left\{x\inℕ;x⋮8;x\le30\right\}\)
=> \(x\in\left\{0;8;16;24\right\}\)
Vậy: ...........
b.
Ta có: \(4⋮x-1\)
\(\Rightarrow x-1\in B\left(4\right)=\left\{1;2;4\right\}\) ( vì \(x\inℕ\))
\(\Rightarrow x\in\left\{2;3;5\right\}\)
Vậy:...............
14 tháng 10 2018
Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3
\(a,4\le2^x< 32\\ \Rightarrow2^2\le2^x< 2^5\\ \Rightarrow x\in\left\{2;3;4\right\}\)