Question

Tính nhanh 3/8 : 9/4 + 3/8 : 9/5

Answer 1

3/8 : 9/4 + 3/8 : 9/5

= 3/8 x 4/9 + 3/8 x 5/9

= 3/8 x (4/9 + 5/9)

= 3/8 x 1

= 3/8

Answer 2

\(\dfrac{3}{8}:\dfrac{9}{4}+\dfrac{3}{8}:\dfrac{9}{5}=\dfrac{3}{8}\times\dfrac{4}{9}+\dfrac{3}{8}\times\dfrac{5}{9}=\dfrac{3}{8}\times\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{3}{8}\times\dfrac{9}{9}=\dfrac{3}{8}\times1=\dfrac{3}{8}\)

Answer 3

Answer 4

3/8 : 9/4 + 3/8 : 9/5

= 3/8 : ( 9/4 + 9/5 )

= 3/8 : ( 45/20 + 36/20 )

= 3/8 : 81/20

= 3/8 x 20/81

= 60/648

= 5/54

Answer 5

3/8