Question

tính nhanh:

  \(\dfrac{4}{8} \) x \(\dfrac{5}{7}\) + \(\dfrac{4}{8}\) : \(\dfrac{7}{5}\)

Answer 1

\(=\dfrac{4}{8}\cdot\dfrac{5}{7}+\dfrac{4}{8}\cdot\dfrac{5}{7}=\dfrac{1}{2}\cdot\dfrac{10}{7}=\dfrac{5}{7}\)

Answer 2

`4/8 xx 5/7 + 4/8 xx 5/7`

`= 4/8 xx ( 5/7 + 5/7)`

`= 4/8 xx 10/7`

` = 1/2 xx 10/7`

`= 10/14`

`= 5/7`

`#BaoL i n h`

Answer 3

`4/8xx5/7+4/8:7/5`

`=4/8xx5/7+4/8xx5/7`

`=(4/8xx4/8)+(5/7xx5/7)`

`=0+0`

`=0`

Answer 4

\(=\dfrac{4}{8}\times\dfrac{5}{7}+\dfrac{4}{8}\times\dfrac{5}{7}=\dfrac{1}{2}\times\dfrac{10}{7}=\dfrac{10}{14}=\dfrac{5}{7}\)