Question

1/2  - ( 40% - 0,75) giúp mình với 

 

 

Answer 1

\(\dfrac{1}{2}-\left(40\%-0,75\right)\)

\(=\dfrac{1}{2}-\left(\dfrac{40}{100}-\dfrac{3}{4}\right)\)

\(=\dfrac{1}{2}-\left(\dfrac{2}{5}-\dfrac{3}{4}\right)\)

\(=\dfrac{1}{2}-\left(\dfrac{8}{20}-\dfrac{15}{20}\right)\)

\(=\dfrac{1}{2}-\left(-\dfrac{7}{20}\right)\)

\(=\dfrac{1}{2}+\dfrac{7}{20}\)

\(=\dfrac{10}{20}+\dfrac{7}{20}\)

\(=\dfrac{17}{20}\)