\(\left(\frac{2}{3}+x\right)\left(\frac{1}{5}-2x\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}\frac{2}{3}+x=0\\\frac{1}{5}-2x=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-\frac{2}{3}\\-2x=-\frac{1}{5}\end{cases}\Leftrightarrow}}\orbr{\begin{cases}x=-\frac{2}{3}\\x=\frac{1}{10}\end{cases}}\)

Vậy:.......

#H

\(\left(\frac{2}{3}+x\right)\left(\frac{1}{5}-2x\right)=0\)

\(\Rightarrow\frac{2}{3}+x=0\)hoặc\(\frac{1}{5}-2x=0\)

\(\Rightarrow x=-\frac{2}{3}\)   hoặc\(2x=\frac{1}{5}\)

\(\Rightarrow x=-\frac{2}{3}\)   hoặc\(x=\frac{1}{10}\)

(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

Cảm ơn mn lần nx ạ

\(\frac{17-x}{1+\frac{1}{2}}=1-\frac{1}{12}.x=>\frac{17-x}{\frac{3}{2}}=1-\frac{1}{12}.x=>\frac{\left(17-x\right).2}{3}=1-\frac{1}{12}.x\)

\(=>\left(17-x\right).2=\left(1-\frac{1}{12}.x\right).3=>34-2x=3-\frac{1}{4}x\)

\(=>34-2x-3+\frac{1}{4}x=0=>-\frac{7}{4}x+31=0=>-\frac{7}{4}x=-31=>x=\left(-31\right):\left(-\frac{7}{4}\right)=\frac{124}{7}\)

ĐỀ SAI RỒI

Bài 1:

\(\frac{7}{12}+\frac{-8}{15}=\frac{7}{12}-\frac{8}{15}=\frac{35}{60}-\frac{32}{60}=\frac{3}{60}=\frac{1}{20}\)

\(\frac{5}{12}+\frac{-8}{15}=\frac{5}{12}-\frac{8}{15}=\frac{25}{60}-\frac{32}{60}=\frac{-7}{60}\)

Bài 2:

\(a,x-23=-56\)

\(x=-56+23\)

\(x=-33\)

\(b,2x-36=24\)

\(2x=60\)

\(x=30\)

\(c,x-\frac{4}{5}=\frac{3}{2}\)

\(x=\frac{3}{2}+\frac{4}{5}=\frac{23}{10}\)

\(d,x-46=123\)

\(x=123+46=169\)

\(e,2x-25=-45\)

\(2x=-20\)

\(x=-10\)

\(f,x-\frac{2}{3}=-\frac{7}{5}\)

\(x=-\frac{7}{5}+\frac{2}{3}=-\frac{11}{15}\)

=.= hk tốt!!

cảm ơn bạn

* \(\left(x-\frac{5}{24}\right)\cdot\frac{18}{7}=-\frac{12}{7}\)

<=> \(x-\frac{5}{24}=-\frac{2}{3}\)

<=> \(x=-\frac{11}{24}\)

* \(\frac{3}{4}+\frac{1}{4}\left(x-1\right)=\frac{1}{2}\)

<=> \(\frac{x-1}{4}=\frac{-1}{4}\)

<=> \(x-1=-1\)

<=> \(x=0\)

* \(\left(4x-\frac{1}{2}\right)\left(\frac{x}{3}-\frac{1}{5}\right)=0\)

<=> \(\orbr{\begin{cases}4x-\frac{1}{2}=0\\\frac{x}{3}-\frac{1}{5}=0\end{cases}}\)<=> \(\orbr{\begin{cases}4x=\frac{1}{2}\\\frac{x}{3}=\frac{1}{5}\end{cases}}\)<=> \(\orbr{\begin{cases}x=\frac{1}{8}\\x=\frac{3}{5}\end{cases}}\)

1/2 : 2x = -1/3

         2x = 1/2 : (-1/3)

         2x = 1/2 . (-3)

         2x = -3/2

           x = -3/2 : 2

           x = -3/2 . 1/2

           x = -3/4