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\(|\frac{2x-1}{3}|+\frac{2}{5}=0.75\)
\(\Rightarrow|\frac{2x-1}{3}|=\frac{7}{4}-\frac{2}{5}=\frac{27}{20}\)
\(\Rightarrow\hept{\begin{cases}\frac{2x-1}{3}=\frac{27}{20}\\\frac{2x-1}{3}=-\frac{27}{20}\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}2x-1=\frac{81}{20}\\2x-1=-\frac{81}{20}\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=\frac{101}{40}\\x=-\frac{61}{40}\end{cases}}\)
P/s : Không chắc :))
\(\left|2x-\frac{1}{3}\right|+\frac{2}{5}=0.75\)
\(\left|2x-\frac{1}{3}\right|+\frac{2}{5}=\frac{3}{4}\)
\(\Rightarrow\left|2x-\frac{1}{3}\right|=\frac{7}{20}\)
\(\Rightarrow\orbr{\begin{cases}2x-\frac{1}{3}=\frac{7}{20}\\2x-\frac{1}{3}=-\frac{7}{20}\end{cases}}\Rightarrow\orbr{\begin{cases}2x=\frac{41}{60}\\2x=-\frac{1}{60}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{41}{120}\\x=-\frac{1}{120}\end{cases}}\)(Đến đoạn này bạn tính lại hộ mình nhé.mik hay tính sai:3)
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\(a\left(\frac{1}{2}-\frac{1}{4}+....+\frac{1}{8}-\frac{1}{10}\right).y=\frac{1}{3}\)
\(\left(\frac{1}{2}-\frac{1}{10}\right).y=\frac{1}{3}\)
\(\frac{2}{5}.y=\frac{1}{3}\)
\(y=\frac{1}{3}:\frac{2}{5}\)
\(y=\frac{5}{6}\)
\(b,\left(\frac{1}{1}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+....+\frac{1}{9}-\frac{1}{11}\right).y=\frac{2}{3}\)
\(\left(\frac{1}{1}-\frac{1}{11}\right).y=\frac{2}{3}\)
\(\frac{10}{11}.y=\frac{2}{3}\)
\(y=\frac{2}{3}:\frac{10}{11}\)
\(y=\frac{22}{30}\)
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=>3025=(x+1)^2 NHỚ K ĐÓ nha bạn
=>x+1=55 hoặc x+1=-55
=>x=54 hoăc x=-56
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( 1/2 + 1/3 + 1/4 + ... + 1/10 ) . x = 1/9 + 2/8 + ... + 9/1
=> x = ( 1/9 + 2/8 + ... + 9/1 ) : ( 1/2 + 1/3 + ... 1/10 )
=> x = ( 9/1 + 8/2 + ... + 2/8 + 1/9 ) : ( 1/2 + 1/3 + 1/4 + ... + 1/10 )
=>x = [ ( 9 - 1 - 1 -... - 1 ) +( 8/2 + 1 ) + ( 7/3 + 1 ) + ... + ( 1/9 + 1 ) ] : ( 1/2 + 1/3 + 1/4 + ... + 1/10 )
=> x = ( 1 + 10/2 + 10/3 + ... + 10/9 ) : ( 1/2 + 1/3 + 1/4 + ... + 1/10 )
=> x = [10 . ( 1/2 + 1/3 + ... + 1/9 ) ] : ( 1/2 + 1/3 + 1/4 + ... + 1/10 )
=> x = 10
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