Question

Bài 1: Thực hiện phép tính (hợp lý nếu có thể

2- 3và3/4 : ( 5/8 - 20 phần trăm )

NHỜ MỌI NGƯỜI GIÚP!

Answer 1

`2-3 3/4:(5/8-20%)`
`=2-3 3/4:(5/8-1/4)`
`=2-15/4:3/8`
`=2-10`
`=-8`

Answer 2

\(2-3\dfrac{3}{4}:\left(\dfrac{5}{8}-20\%\right)\)
\(=2-\dfrac{15}{4}:\left(\dfrac{5}{8}-\dfrac{20}{100}\right)\)

\(=\dfrac{2}{1}-\dfrac{15}{4}:\left(\dfrac{5}{8}-\dfrac{1}{5}\right)\)

\(=\dfrac{2}{1}-\dfrac{15}{4}:\left(\dfrac{25}{40}-\dfrac{8}{40}\right)\)

\(=\dfrac{2}{1}-\dfrac{15}{4}:\dfrac{17}{40}\)

\(=\dfrac{2}{1}-\dfrac{15}{4}.\dfrac{40}{17}\)

\(=\dfrac{2}{1}-\dfrac{600}{68}\)

\(=\dfrac{2}{1}-\dfrac{150}{17}\)

\(=\dfrac{34}{17}-\dfrac{150}{17}\)

\(=\dfrac{-116}{17}\)

Answer 3

\(2-3\dfrac{3}{4}:\left(\dfrac{5}{8}-20\%\right)\) 

\(=2-\dfrac{15}{4}:\left(\dfrac{5}{8}-\dfrac{1}{5}\right)\) 

\(=2-\dfrac{15}{4}:\dfrac{17}{40}\) 

\(=2-\dfrac{150}{17}\) 

\(=\dfrac{-116}{17}\)