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\(\left(\frac{2}{3}+x\right)\left(\frac{1}{5}-2x\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}\frac{2}{3}+x=0\\\frac{1}{5}-2x=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-\frac{2}{3}\\-2x=-\frac{1}{5}\end{cases}\Leftrightarrow}}\orbr{\begin{cases}x=-\frac{2}{3}\\x=\frac{1}{10}\end{cases}}\)
Vậy:.......
#H
(2/3×x-1/3)=2/3+1/3
(2/3×x-1/3)=3/3
2/3×x=3/3+1/3
2/3×x=4/3
x=4/3:3/2
x=4/3×2/3
x=8/9
\(\frac{17-x}{1+\frac{1}{2}}=1-\frac{1}{12}.x=>\frac{17-x}{\frac{3}{2}}=1-\frac{1}{12}.x=>\frac{\left(17-x\right).2}{3}=1-\frac{1}{12}.x\)
\(=>\left(17-x\right).2=\left(1-\frac{1}{12}.x\right).3=>34-2x=3-\frac{1}{4}x\)
\(=>34-2x-3+\frac{1}{4}x=0=>-\frac{7}{4}x+31=0=>-\frac{7}{4}x=-31=>x=\left(-31\right):\left(-\frac{7}{4}\right)=\frac{124}{7}\)
a: =>4/3x=7/9-4/9=1/3
=>x=1/4
b: =>5/2-x=9/14:(-4/7)=-9/8
=>x=5/2+9/8=29/8
c: =>3x+3/4=8/3
=>3x=23/12
hay x=23/36
d: =>-5/6-x=7/12-4/12=3/12=1/4
=>x=-5/6-1/4=-10/12-3/12=-13/12
* \(\left(x-\frac{5}{24}\right)\cdot\frac{18}{7}=-\frac{12}{7}\)
<=> \(x-\frac{5}{24}=-\frac{2}{3}\)
<=> \(x=-\frac{11}{24}\)
* \(\frac{3}{4}+\frac{1}{4}\left(x-1\right)=\frac{1}{2}\)
<=> \(\frac{x-1}{4}=\frac{-1}{4}\)
<=> \(x-1=-1\)
<=> \(x=0\)
* \(\left(4x-\frac{1}{2}\right)\left(\frac{x}{3}-\frac{1}{5}\right)=0\)
<=> \(\orbr{\begin{cases}4x-\frac{1}{2}=0\\\frac{x}{3}-\frac{1}{5}=0\end{cases}}\)<=> \(\orbr{\begin{cases}4x=\frac{1}{2}\\\frac{x}{3}=\frac{1}{5}\end{cases}}\)<=> \(\orbr{\begin{cases}x=\frac{1}{8}\\x=\frac{3}{5}\end{cases}}\)
\(\frac{2}{3}.x-\frac{1}{2}.x=\frac{5}{12}+x\)
\(\Rightarrow\frac{2}{3}.x-\frac{1}{2}.x-x=\frac{5}{12}\)
\(x.\left(\frac{2}{3}-\frac{1}{2}-1\right)=\frac{5}{12}\)
\(x.\left(\frac{-5}{6}\right)=\frac{5}{12}\)
\(x=\frac{5}{12}:\left(\frac{-5}{6}\right)\)
\(x=\frac{-1}{2}\)