Question

tính

-4/9.7/15+4/-9.8/15 

Answer 1

\(\frac{-4}{9}.\frac{7}{15}+\frac{4}{-9}.\frac{8}{15}\)

\(\Rightarrow\frac{-4}{9}.\frac{7}{15}+\frac{-4}{9}.\frac{8}{15}\)

\(\Rightarrow\frac{-4}{9}.\left(\frac{7}{15}+\frac{8}{15}\right)\)

\(\Rightarrow\frac{-4}{9}.\frac{15}{15}\)

\(\Rightarrow\frac{-4}{9}.1\)

\(\Rightarrow\frac{-4}{9}\)

Answer 2

\(\frac{-4}{9}.\frac{7}{15}+\frac{4}{-9}.\frac{8}{15}\)

\(=\frac{-4}{9}.\frac{7}{15}+\frac{-4}{9}.\frac{8}{15}\)

\(=\frac{-4}{9}.\left(\frac{7}{15}+\frac{8}{15}\right)\)

\(=\frac{-4}{9}.\frac{15}{15}\)

\(=\frac{-4}{9}.1\)

\(=\frac{-4}{9}\)

Answer 3

\(\frac{-4}{9}.\frac{7}{15}+\frac{4}{-9}.\frac{8}{15}\)=\(\frac{-4}{9}\left(\frac{7}{15}+\frac{8}{15}\right)\)=\(\frac{-4}{9}.\frac{15}{15}\)=\(\frac{-4}{9}.1=\frac{-4}{9}\)

Answer 4

cảm ơn nha!!!!