Question

\(5\dfrac{5}{8}:2\dfrac{1}{2}-1\dfrac{3}{4}\text{×}\dfrac{2}{10}\)

Giá trị biểu thức trên là:

Answer 1

\(=\dfrac{45}{8}:\dfrac{5}{2}-\dfrac{7}{4}\cdot\dfrac{1}{5}\)

\(=\dfrac{45}{8}\cdot\dfrac{2}{5}-\dfrac{7}{20}=\dfrac{45}{20}-\dfrac{7}{20}=\dfrac{38}{20}=\dfrac{19}{10}\)

Answer 2

\(=\dfrac{45}{8}:\dfrac{5}{2}-\dfrac{7}{4}.\dfrac{2}{10}\\ =\dfrac{9}{4}-\dfrac{7}{20}\\ =\dfrac{9.5-7}{20}\\ =\dfrac{19}{10}\)

Answer 3

`5(5)/(8):2(1)/(2)-1(3)/(4)xx(2)/(10)`

`=(45)/(8):(5)/(2)-(7)/(4)xx(1)/(5)`

`=(45)/(8)xx(2)/(5)-(7)/(20)`

`=(45xx2)/(2xx4xx5)-(7)/(20)`

`=(45)/(4xx5)-(7)/(20)`

`=(45-7)/(20)`

`=(38)/(20)=(19)/(10)`

Answer 4

45/8:5/2-7/4.2/10

9/4-7/20

=19/10