Question

Tính:

5/7 x 14/15 ; 4/9 : 2/15

Answer 1

\(\dfrac{5}{7}\times\dfrac{14}{15}=\dfrac{2}{3}\)

\(\dfrac{4}{9}\times\dfrac{15}{2}=\dfrac{10}{3}\)

Answer 2

5/7 x 14/15

= \(\dfrac{2}{3}\)

 4/9 : 2/15

= 4/9 x 15/2 

= \(\dfrac{10}{3}\)

Answer 3

\(\dfrac{5^1}{7^1}\times\dfrac{14^2}{15^3}=\dfrac{2}{3}\) 

\(\dfrac{4}{9}:\dfrac{2}{15}=\dfrac{4^2}{9}\times\dfrac{15}{2^1}=\dfrac{30}{9}=\dfrac{10}{3}\)

Answer 4

5/7 x 14/15 : 4/9 : 2/15

=2/3 :4/9 : 2/15

=2/3 x9/4 x15/2

=3/2x15/2

=     45/4