Question

a) \(\frac{3}{5}:\frac{7}{3}+\frac{3}{5}:\frac{7}{4}-1\frac{3}{5}\)

thực hiện phép tính

Answer 1

\(\frac{3}{5}:\frac{7}{3}+\frac{3}{5}:\frac{7}{4}-1\frac{3}{5}\)

\(=\frac{3}{5}.\frac{3}{7}+\frac{3}{5}.\frac{4}{7}-1\frac{3}{5}\)

\(=\frac{3}{5}.\left(\frac{3}{7}+\frac{4}{7}\right)-1\frac{3}{5}\)

\(=\frac{3}{5}.1-1+\frac{3}{5}\)

\(=\frac{3}{5}-\frac{3}{5}-1\)

\(=-1\)

Answer 2

a) 35 :73 +35 :74 −135 

\(=\frac{3}{5}:\left(\frac{7}{3}+\frac{7}{4}\right)-\frac{8}{5}\) \(=\frac{3}{5}.\frac{49}{12}-\frac{8}{5}\)

\(=\frac{49}{20}-\frac{8}{5}\) 

= \(\frac{17}{20}\)

 

Answer 3

\(\frac{3}{5}:\frac{7}{3}+\frac{3}{5}:\frac{7}{4}-1\frac{3}{5}=\frac{3}{5}\times\frac{3}{7}+\frac{3}{5}\times\frac{4}{7}-\frac{8}{5}=\frac{3}{5}\times\left(\frac{3}{7}+\frac{4}{7}\right)-\frac{8}{5}\)

                                                   \(=\frac{3}{5}\times\frac{7}{7}-\frac{8}{5}=\frac{3}{5}-\frac{8}{5}=\frac{3-8}{5}=\frac{-5}{5}=-1\)