Question

[2/5 + 1/2] x 1/4=

Answer 1

`(2/5+1/2)xx1/4`

`=(4/10+5/10)xx1/4`

`=9/10xx1/4=9/40`

Answer 2

(2/5+1/2)x1/4
= 9/10x1/4
= 9/40

Answer 3

=> ( 4/10 + 5/10) x 1/4

=>9/10 x 1/4 

=> 9/40

Answer 4

\((\dfrac{2}{5}+\dfrac{1}{2})\times\dfrac{1}{4}\)

= (4/10 + 5/10) x 1/4

= 9/10 x 1/4 = 9/40

Answer 5

các bạn làm hai cách nhé

 

Answer 6

C1:

\(\left(\dfrac{2}{5}+\dfrac{1}{2}\right)\times\dfrac{1}{4}=\dfrac{9}{10}\times\dfrac{1}{4}=\dfrac{9}{40}\)

C2:

\(\left(\dfrac{2}{5}+\dfrac{1}{2}\right)\times\dfrac{1}{4}=\dfrac{2}{5}\times\dfrac{1}{4}+\dfrac{1}{2}\times\dfrac{1}{4}=\dfrac{1}{10}+\dfrac{1}{8}=\dfrac{9}{40}\)