Question

Tìm a/b biết

A. a/b : 2/3 = 3/5 - 1/10

B. a/b * 1/5 = 3/5 + 1

Answer 1

a) \(\frac{a}{b}:\frac{2}{3}=\frac{3}{5}-\frac{1}{10}\)

\(\Rightarrow\frac{a}{b}:\frac{2}{3}=\frac{6}{10}-\frac{1}{10}\)

\(\Rightarrow\frac{a}{b}:\frac{2}{3}=\frac{5}{10}\)

\(\Rightarrow\frac{a}{b}=\frac{5}{10}x\frac{2}{3}\)

\(\Rightarrow\frac{a}{b}=\frac{10}{30}\)

\(\Rightarrow\frac{a}{b}=\frac{1}{3}\)

b, \(\frac{a}{b}x\frac{1}{5}=\frac{3}{5}+1\)

\(\Rightarrow\frac{a}{b}x\frac{1}{5}=\frac{3}{5}+\frac{5}{5}\)

\(\Rightarrow\frac{a}{b}x\frac{1}{5}=\frac{8}{5}\)

\(\Rightarrow\frac{a}{b}=\frac{8}{5}:\frac{1}{5}\)

\(\Rightarrow\frac{a}{b}=\frac{8}{5}x5\)

\(\Rightarrow\frac{a}{b}=8\)