Question

4/5.6/2 - 4/5.8/9 - 1/2 = 

các bạn giúp mình với minh cần gấp
 

 

Answer 1

\(\dfrac{4}{5}.\dfrac{6}{2}-\dfrac{4}{5}.\dfrac{8}{9}-\dfrac{1}{2}=\dfrac{12}{5}-\dfrac{32}{45}-\dfrac{1}{2}=\dfrac{76}{45}-\dfrac{1}{2}=\dfrac{107}{90}\)

Answer 2

\(=\dfrac{4}{5}.\dfrac{6}{2}-\dfrac{4}{5}.\dfrac{8}{9}-\dfrac{1}{2}.1\)

\(=\dfrac{4}{5}.\left(\dfrac{6}{2}-\dfrac{1}{2}\right).1\)

\(=\dfrac{4}{5}.\dfrac{5}{2}.1\)

\(=2.1\)

\(=2\)

Answer 3

\(\dfrac{4}{5}.\dfrac{6}{2}-\dfrac{4}{5}.\dfrac{8}{9}-\dfrac{1}{2}\)

\(=\dfrac{4}{5}.\left(\dfrac{6}{2}-\dfrac{8}{9}\right)-\dfrac{1}{2}\)

\(=\dfrac{4}{5}.\dfrac{19}{9}-\dfrac{1}{2}\)

\(=\dfrac{76}{45}-\dfrac{1}{2}\)

\(=\dfrac{107}{90}\)