Question

[Nguyễn Xuân Quân]

(4/5*A/B)-6/25=4/25

Answer 1

[Lương Anh Thư]

(\(\frac{4}{5}\)x\(\frac{a}{b}\)) -\(\frac{6}{25}\)=\(\frac{4}{25}\)

\(\frac{4}{5}\)x\(\frac{a}{b}\)=\(\frac{4}{25}\)+\(\frac{6}{25}\)=\(\frac{10}{25}\)=\(\frac{2}{5}\)

\(\frac{a}{b}\)=\(\frac{2}{5}\):\(\frac{4}{5}\)=\(\frac{2}{5}\)x\(\frac{5}{4}\)=\(\frac{1}{2}\)

Vậy \(\frac{a}{b}\)=\(\frac{1}{2}\)

Answer 2

[.]

Tìm \(\frac{A}{B}\) đúng không nhỉ???

\(\left(\frac{4}{5}\times\frac{A}{B}\right)-\frac{6}{25}=\frac{4}{25}\)

\(\frac{4}{5}\times\frac{A}{B}=\frac{4}{25}+\frac{6}{25}\)

\(\frac{4}{5}\times\frac{A}{B}=\frac{2}{5}\)

\(\frac{A}{B}=\frac{2}{5}:\frac{4}{5}\)

\(\frac{A}{B}=\frac{2}{5}\times\frac{5}{4}\)

\(\frac{A}{B}=\frac{1}{2}\)