Question

 tìmx biết

 \(\left(\frac{3x}{7}\left|+1\right|\right):\left(-1\right)=\frac{-1}{28}\)

Answer 1

Chú ý : \(\left|+1\right|\)cũng vẫn là bằng 1

Ta có : \((\frac{3x}{7}\cdot1):(-1)=\frac{-1}{28}\)

\(\Rightarrow(\frac{3x}{7}\cdot1)=\frac{-1}{28}\cdot(-1)\)

\(\Rightarrow(\frac{3x}{7}\cdot1)=\frac{1}{28}\)

\(\Rightarrow\frac{3x}{7}=\frac{1}{28}:1\)

\(\Rightarrow\frac{3x}{7}=\frac{1}{28}\)

\(\Rightarrow3x=\frac{1}{28}\cdot7\)

\(\Rightarrow3x=\frac{1}{4}\)

\(\Rightarrow x=\frac{1}{4}\div3\)

\(\Rightarrow x=\frac{1}{12}\)