Th1 tách khỏi Th2, đáp án Th2 là \(\frac{1}{12}\)

\(e,\left|x\right|-\frac{3}{4}=\frac{5}{3}\)

\(\left|x\right|=\frac{5}{3}+\frac{3}{4}\)

\(\left|x\right|=\frac{20}{12}+\frac{9}{12}\)

\(\left|x\right|=\frac{11}{12}\)

⇒\(x=\frac{11}{12}\)hoặc\(x=\frac{-11}{12}\)

\(f,\left|2x-\frac{1}{3}\right|+\frac{5}{6}=1\)

\(\left|2x-\frac{1}{3}\right|=1-\frac{5}{6}\)

\(\left|2x-\frac{1}{3}\right|=\frac{1}{6}\)

\(\Rightarrow2x-\frac{1}{3}=\frac{1}{6}\)hoặc \(2x-\frac{1}{3}=\frac{-1}{6}\)

Ta có 2 trường hợp.

\(TH1.2x-\frac{1}{3}=\frac{1}{6}\) \(TH2.2x-\frac{1}{3}=\frac{-1}{6}\)

\(2x=\frac{1}{6}+\frac{1}{3}\) \(2x=\frac{-1}{6}+\frac{1}{3}\)

\(2x=\frac{1}{6}+\frac{2}{6}\) \(2x=\frac{-1}{6}+\frac{2}{6}\)

\(x=\frac{1}{2}:2\) \(x=\frac{-1}{6}:2\)

\(x=\frac{1}{4}\) \(x=\frac{1}{14}\)

coi số tiền vốn là 100% thì tiền bán ra là:100%-12%-4%=88%

số tiền vốn là:65000:100x88=57200(đồng)

9 ngày

\(a,\frac{2}{3}x-\frac{3}{2}x=\frac{5}{12}\)

\(\frac{4}{6}x-\frac{9}{6}x=\frac{5}{12}\)

\(\frac{-5}{6}x=\frac{5}{12}\)

\(x=\frac{5}{12}:\frac{-5}{6}\)

\(x=\frac{-1}{2}\)

\(b,\frac{2}{5}+\frac{3}{5}\cdot\left(3x-3,7\right)=\frac{-53}{10}\)

\(\frac{3}{5}\cdot\left(3x-3,7\right)=\frac{-53}{10}-\frac{2}{5}\)

\(\frac{3}{5}\cdot\left(3x-3,7\right)=\frac{-53}{10}-\frac{4}{10}\)

\(3x-3,7=\frac{-57}{10}:\frac{3}{5}\)

\(3x=\frac{-19}{2}+\frac{37}{10}\)

\(3x=\frac{-95}{10\text{​​}\text{​​}\text{​​}}+\frac{37}{10}\)

\(x=\frac{-29}{5}:3\)

\(x=\frac{-29}{15}\)

câu C 19

\(a,\frac{2}{3}x-\frac{2}{3}=\frac{5}{12}\)

\(\frac{2}{3}x=\frac{5}{12}+\frac{2}{3}\)

\(\frac{2}{3}x=\frac{5}{12}+\frac{8}{12}\)

\(x=\frac{13}{12}:\frac{2}{3}\)

\(x=\frac{13}{8}\)

\(b,\left(\frac{7}{2}+2x\right)\cdot2\frac{2}{3}=5\frac{1}{3}\)

\(\left(\frac{7}{2}+2x\right)\cdot\frac{8}{3}=\frac{16}{3}\)

\(\frac{7}{2}+2x=\frac{16}{3}:\frac{8}{3}\)

\(2x=2-\frac{7}{2}\)

\(x=\frac{-3}{2}:2\)

\(x=-3\)

Bát Quái Đại Bàng Chính Nghĩa chính nghĩa cái j mày nên đổi thành Người vô liên xỉ thì hay hơn =))