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a, => |5/3.x| = 1/6
=> 5/3.x = -1/6 hoặc 5/3.x = 1/6
=> x = -1/10 hoặc x = 1/10
Tk mk nha
a.
\(\left(x+\frac{1}{2}\right)\times\left(x-\frac{3}{4}\right)=0\)
TH1:
\(x+\frac{1}{2}=0\)
\(x=-\frac{1}{2}\)
TH2:
\(x-\frac{3}{4}=0\)
\(x=\frac{3}{4}\)
Vậy \(x=-\frac{1}{2}\) hoặc \(x=\frac{3}{4}\)
b.
\(\left(\frac{1}{2}x-3\right)\times\left(\frac{2}{3}x+\frac{1}{2}\right)=0\)
TH1:
\(\frac{1}{2}x-3=0\)
\(\frac{1}{2}x=3\)
\(x=3\div\frac{1}{2}\)
\(x=3\times2\)
\(x=6\)
TH2:
\(\frac{2}{3}x+\frac{1}{2}=0\)
\(\frac{2}{3}x=-\frac{1}{2}\)
\(x=-\frac{1}{2}\div\frac{2}{3}\)
\(x=-\frac{1}{2}\times\frac{3}{2}\)
\(x=-\frac{3}{4}\)
Vậy \(x=6\) hoặc \(x=-\frac{3}{4}\)
c.
\(\frac{2}{3}-\frac{1}{3}\times\left(x-\frac{3}{2}\right)-\frac{1}{2}\times\left(2x+1\right)=5\)
\(\frac{2}{3}-\frac{1}{3}x+\frac{1}{2}-x-\frac{1}{2}=5\)
\(\left(\frac{1}{2}-\frac{1}{2}\right)-\left(\frac{1}{3}x+x\right)=5-\frac{2}{3}\)
\(-\frac{4}{3}x=\frac{13}{3}\)
\(x=\frac{13}{3}\div\left(-\frac{4}{3}\right)\)
\(x=\frac{13}{3}\times\left(-\frac{3}{4}\right)\)
\(x=-\frac{13}{4}\)
d.
\(4x-\left(x+\frac{1}{2}\right)=2x-\left(\frac{1}{2}-5\right)\)
\(4x-x-\frac{1}{2}=2x-\frac{1}{2}+5\)
\(4x-x-2x=\frac{1}{2}-\frac{1}{2}+5\)
\(x=5\)
Mấy câu trên dễ rồi mình hướng dẫn bạn làm câu d và e
d)
\(\left(x-\frac{2}{3}\right)\cdot\left(1-\frac{4}{16}x\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-\frac{2}{3}=0\\1-\frac{1}{4}x=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{2}{3}\\x=4\end{cases}}\)
Câu e, tương tự nhé bạn
a. \(\frac{3}{4}x-\frac{1}{5}=\frac{2}{3}\)
\(\frac{3}{4}x=\frac{13}{15}\)
\(x=\frac{52}{45}\)
b. \(\frac{2}{5}.\left(x+1\right)-\frac{1}{2}=0\)
\(\frac{2}{5}.\left(x+1\right)=\frac{1}{2}\)
\(x+1=\frac{5}{4}\)
\(x=\frac{1}{4}\)
c.\(\frac{1}{5}.x-\frac{2}{3}=\frac{4}{8}\)
\(\frac{1}{5}.x=\frac{7}{6}\)
\(x=\frac{35}{6}\)
d. \(\left(x-\frac{2}{3}\right).\left(1-\frac{4}{16}x\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-\frac{2}{3}=0\\1-\frac{4}{16}x=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0+\frac{2}{3}\\\frac{4}{16}x=1\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=\frac{2}{3}\\x=4\end{cases}}}\)
Vậy x = 2/3 hoặc x = 4
e. \(\left(0,32-x\right).\left(4,5-\frac{3}{2}x\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}0,32-x=0\\4,5-\frac{3}{2}x=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0,32-0\\\frac{3}{2}x=4,5\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=0,32\\x=3\end{cases}}}\)
Vậy x = 0,32 hoặc x = 3
a) \(\frac{2}{3}-\frac{1}{3}\left(x-\frac{3}{2}\right)-\frac{1}{2}\left(2x+1\right)=5\)\(5\)
=> \(\frac{2}{3}-\left(\frac{1}{3}x-\frac{1}{2}\right)-\left(x+\frac{1}{2}\right)=5\)
=>\(\frac{2}{3}-\frac{1}{3}x+\frac{1}{2}-x-\frac{1}{2}=5\)
=>\(\left(\frac{2}{3}+\frac{1}{2}-\frac{1}{2}\right)-\left(\frac{1}{3}x+x\right)=5\)
=>\(\frac{2}{3}-\frac{4}{3}x=5\)
=>\(\frac{4}{3}x=\frac{2}{3}-5=-\frac{13}{3}\)
=>\(x=-\frac{13}{3}:\frac{4}{3}=-\frac{13}{4}\)
b)\(4x-\left(x+\frac{1}{2}\right)=2x-\left(\frac{1}{2}-5\right)\)
=>\(4x-x-\frac{1}{2}=2x-\left(-\frac{9}{2}\right)\)
=> \(3x-\frac{1}{2}=2x-\left(-\frac{9}{2}\right)\)
=>\(x=-\left(-\frac{9}{2}\right)+\frac{1}{2}=5\)
\(\left(x+\frac{1}{2}\right)\left(x-\frac{3}{4}\right)=0\)
\(\Rightarrow\hept{\begin{cases}x+\frac{1}{2}=0\\x-\frac{3}{4}=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=-\frac{1}{2}\\x=\frac{3}{4}\end{cases}}\)
x+4/3000 + x+3/3001 = x+2/3002 + x+1/3003
=> (x+4/3000 + x+3/3001) - (x+2/3002 + x+1/3003) = 0
=> (x+4/3000 + 1 + x+3/3001 + 1) - (x+2/3002 + 1 + x+1/3003 + 1) = 0
=> (x+3004/3000 + x+3004/3001) - (x+3004/3002 + x+3004/3003) = 0
=> (x+3004) x (1/3000 + 1/3001) - (x+3004) x (1/3002 + 1/3003) = 0
=> (x+3004) x [(1/3000 + 1/3001) - [(1/3002 + 1/3003)] = 0
=> x+3004 = 0 hoặc (1/3000 + 1/3001) - (1/3002 + 1/3003) = 0
Mà 1/3000 + 1/3001 > 1/3002 + 1/3003 => (1/3000 + 1/3001) - (1/3002 + 1/3003) khác 0
=> x+3004 = 0
=> x = 0-3004 = -3004
Vậy x = -3004
(x + 3).(x + 1/2) < 0
=> trong 2 số x + 3 và x + 1/2 có 1 số < 0 và 1 số > 0
Mà x + 3 > x + 1/2
=> x + 3 > 0 và x + 1/2 < 0
=> x > -3 và x < -1/2
=> x > -6/2 và x < -1/2
=> x thuộc { -5/2 ; -4/2 ;-3/2}
Vậy x thuộc { -5/2 ; -4/2 ; -3/2}