Question

x-4/9:2/3=1/4                                                                                                                                                      5/7nhân x+2/5=2/3

Answer 1

a)x-4/9:2/3=1/4  

\(\Leftrightarrow x-\frac{4}{9}=\frac{1}{4}\times\frac{2}{3}\)

\(\Leftrightarrow x-\frac{4}{9}=\frac{1}{6}\)

\(\Leftrightarrow x=\frac{1}{6}+\frac{4}{9}\)

\(\Leftrightarrow x=\frac{11}{18}\)

Answer 2

    \(\frac{5}{7}\).x+\(\frac{2}{5}\)=\(\frac{2}{3}\)

<=>\(\frac{5}{7}\).x=\(\frac{4}{15}\)

<=>    x=\(\frac{4}{15}\):\(\frac{5}{7}\)

<=>  x= \(\frac{28}{75}\)

Answer 3

b.   \(\frac{5}{7}\).x+\(\frac{2}{5}\)=\(\frac{2}{3}\)

\(\frac{5}{7}\).x=\(\frac{2}{3}\)-\(\frac{2}{5}\)

\(\frac{5}{7}\).x=\(\frac{4}{15}\)

x=\(\frac{4}{15}\):\(\frac{5}{7}\)

x=\(\frac{28}{75}\)

Answer 4

a) \(x-\frac{4}{9}:\frac{2}{3}=\frac{1}{4}\)

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

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

\(\Rightarrow x=\frac{11}{12}\)

b) \(\frac{5}{7}\times x+\frac{2}{5}=\frac{2}{3}\)

\(\Rightarrow\frac{5}{7}\times x=\frac{2}{3}-\frac{2}{5}\)

\(\Rightarrow x=\frac{4}{15}\div\frac{5}{7}\)

\(\Rightarrow x=\frac{28}{75}\)