Question

tính giá trị biểu thức          a) 6 : 5/2 - 3/10                b) 4/6 : 4/3 + 5 : 4/3

Answer 1

6 : \(\dfrac{5}{2}-\dfrac{3}{10}=\dfrac{12}{5}-\dfrac{3}{10}=\dfrac{21}{10}\)

\(\dfrac{4}{6}:\dfrac{4}{3}+5:\dfrac{4}{3}=\left(\dfrac{4}{6}+5\right):\dfrac{4}{3}=\dfrac{17}{3}:\dfrac{4}{3}=\dfrac{17}{4}\)

Answer 2

a) 6 : 5/2 - 3/10

= 6 x 2/5 - 2/10

= 12/5 - 3/10

=21/10

b) 4/6 : 4/3 + 5 : 4/3

= ( 4/6 + 5) : 4/3

= 17/3 : 4/3

= 17/4

 

Answer 3

a) 12/5 - 3/10

= 24/10 - 3/10 

= 21/10

b) ( 4/6 + 5 ) : 4/3

= 17/3 : 4/3

= 17/4