Given \(A=1+2+2^2+2^3+...+2^{100}\)
If \(2^{50}\times\left(A+1\right)=2^m\) then \(m=...\)
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A = 1 + 2 + 22 + 23 + ... + 2100
2A = 2 + 22 + ... + 2101
2A - A = 2101 - 1
A = 2101 - 1
=> 250.(2101-1+1) = 2m
=> 250.2101=2m
=> 2151 = 2m
=> m = 151
A = 1 + 2 + 22 + ... + 2100
2A = 2 + 22 + ... + 2101
2A - A = 2101 - 1
A = 2101 - 1
=> 250 . ( 2101 - 1 + 1 ) = 2m
=> 250.2101 = 2m
=> 2151 = m
=> m = 151
2A=2+22+23+...+2101
2A+1=1+2+22+...+2101=A+2101
2A-A=2101-1
A=2101-1
nên 250*(A+1)=250*(2101-1+1)=250*2101=2151
Vậy m=151
Ban dich day :
Cho A=1+2+22+23+...+2100
Neu 250. (A+1)=2m thi m=
Tra loi: m=
Tich nha!
\(M=\left(100-1\right)\left(100-2^2\right)...\left(100-50^2\right)\)
\(M=\left(100-1\right)\left(100-2^2\right)...\left(100-10^2\right)...\left(100-50^2\right)\)
\(M=\left(100-1\right)\left(100-2^2\right)...\left(100-100\right)...\left(100-50^2\right)\)
\(M=\left(100-1\right)\left(100-2^2\right)...0...\left(100-50^2\right)\)
\(M=0\)
Ta có:
\(\begin{array}{l}M = \left( {{{10}^2} - 1} \right).\left( {{{10}^2} - {2^2}} \right).\left( {{{10}^2} - {3^2}} \right).\,\,...\left( {{{10}^2} - {{10}^2}} \right)..\,\,.\left( {100 - {{50}^2}} \right)\\ = \left( {{{10}^2} - 1} \right).\left( {{{10}^2} - {2^2}} \right).\left( {{{10}^2} - {3^2}} \right).... 0 ...\left( {100 - {{50}^2}} \right)\\ = 0\end{array}\)
a) \(\left(\frac{2}{3}\right)^x=\left(\frac{4}{9}\right)^{50}\)
\(\Rightarrow\left(\frac{2}{3}\right)^x=\left(\frac{2^2}{3^2}\right)^{50}\)
\(\Rightarrow\left(\frac{2}{3}\right)^x=\left(\frac{2}{3}\right)^{100}\)
\(\Rightarrow x=100\)
Vậy x = 100
b) \(\left(\frac{2}{3}-x\right)^2=\frac{1}{36}\)
\(\Rightarrow\left(\frac{2}{3}-x\right)^2=\left(\frac{1}{6}\right)^2\)
\(\Rightarrow\frac{2}{3}-x=\frac{1}{6}\)
\(\Rightarrow x=\frac{2}{3}-\frac{1}{6}\)
\(\Rightarrow x=\frac{1}{2}\)
Vậy \(x=\frac{1}{2}\)
2)
Ta có:
\(74^{m+1}+74^m=74^m.74^1+74^m=74^m.\left(74+1\right)=74^m.75⋮25\)
( vì \(75⋮25\) )
\(\Rightarrowđpcm\)
Mk hỉu đề bài ns dề ng mk giải = Tiếng Việt nha, mk ko giỏi Anh cho lém
A = 1 + 2 + 22 + 23 + ... + 2100
2A = 2 + 22 + 23 + 24 + ... + 2101
2A - A = (2 + 22 + 23 + 24 + ... + 2101) - (1 + 2 + 22 + 23 + ... + 2100)
A = 2101 - 1
=> A + 1 = 2101
Ta có: 250 x 2101 = 2m
=> 2151 = 2m
=> m = 151
Ủng hộ mk nha ^_-