Question

Tính giá trị của các biểu thức sau
a) (8+2/1/3)-(5+0,4)-(3/1/3-2)
b) (7-1/2-3/4):(5-1/4-5/8)

Answer 1

a: \(=8+2+\dfrac{1}{3}-5-\dfrac{2}{5}-3-\dfrac{1}{3}+2\)

=4-2/5

=3,6

b: \(=\left(\dfrac{28}{4}-\dfrac{2}{4}-\dfrac{3}{4}\right):\left(\dfrac{40}{8}-\dfrac{2}{8}-\dfrac{5}{8}\right)\)

\(=\dfrac{23}{4}:\dfrac{33}{8}=\dfrac{23}{4}\cdot\dfrac{8}{33}=\dfrac{46}{33}\)

Answer 2

Answer 3

`a) (8+2 1/3)-(5+0,4)-(3 1/3-2)`

`= 8 + 7/3 - 3/5 - 5 - 2/5 - 10/3 + 2`

`= ( 8 - 5 + 2 ) + ( 7/3 - 10/3 ) - ( 3/5 + 2/5)`

`= 5 - 1 - 1`

`= 3`

`b) (7-1/2-3/4):(5-1/4-5/8)`

`= ( 28/4 - 2/4 - 3/4 ) : ( 40/8 - 2/8 - 5/8 )`

`= ( (28 - 2 - 3 )/4 ) : ( ( 40 - 2 - 5 )/8 )`

`= 23/4 : 33/8`

`= 23/4 . 8/33`

`= 46/33`