Question

2.x.(x-\(\frac{1}{7}\))=0

\(\frac{3}{4}\)+\(\frac{1}{4}\):x=\(\frac{2}{5}\)

Làm nhanh hộ mình nha!

Answer 1

\(\frac{3}{4}+\frac{1}{4}:x=\frac{2}{5}\)

\(\frac{1}{4}:x=\frac{2}{5}-\frac{3}{4}\)

\(\frac{1}{4}:x=\frac{-7}{20}\)

\(x=\frac{1}{4}:\frac{-7}{20}\)

\(x=\frac{-5}{7}\)

\(2x\left(x-\frac{1}{7}\right)=0\)

\(=>x=0\)         hoặc  \(x-\frac{1}{7}=0\)

                                             \(x=0+\frac{1}{7}\)

                                              \(x=\frac{1}{7}\)

Vậy \(x\in\left\{0;\frac{1}{7}\right\}\)

Answer 2

Mình làm câu b thôi nha 

\(\frac{3}{4}\) + \(\frac{1}{4}\) : x = \(\frac{2}{5}\)

 \(1\) : x = \(\frac{2}{5}\)

x = \(1\) * \(\frac{2}{5}\)

x = \(\frac{5}{2}\)

Answer : \(\frac{5}{2}\)