Trả lời :
\(x+30\%\cdot x=-\frac{1}{3}\)
\(x+\frac{3}{10}\cdot x=-\frac{1}{3}\)
\(x\left(1+\frac{3}{10}\right)=-\frac{1}{3}\)
\(\frac{13}{10}x=-\frac{1}{3}\)
\(x=-\frac{1}{3}:\frac{13}{10}\)
\(x=-\frac{10}{39}\)
Vậy \(x=-\frac{10}{39}\)
Hok tốt
-Ken-
\(x+30\%x=-1,3\)
\(\Leftrightarrow1x+\frac{30}{100}x=-1,3\)
\(\Leftrightarrow\frac{10}{10}x+\frac{3}{10}x=-1,3\)
\(\Leftrightarrow x\left(\frac{10}{10}+\frac{3}{10}\right)=-1,3\)
\(\Leftrightarrow\frac{13}{10}x=\frac{-13}{10}\)
\(\Leftrightarrow x=\frac{-13}{10}\div\frac{13}{10}\)
\(\Leftrightarrow x=\frac{-13}{10}\times\frac{10}{13}\)
\(\Leftrightarrow x=-1\)
