Question

7. Tính

2/5+3/8=.............................................

8/9 x7/5=.............................................

ai lằm nhanh mình cho một tích

 

Answer 1

`7)`

`2/5+3/8`

`=16/40+15/40`

`=31/40`

__

`8/9xx7/5`

`=(8xx7)/(9xx5)`

`=56/45`

Answer 2

\(\dfrac{2}{5}+\dfrac{3}{8}=\dfrac{16+15}{40}=\dfrac{31}{40}\)

\(\dfrac{8}{9}\times\dfrac{7}{5}=\dfrac{8\times7}{9\times5}=\dfrac{56}{45}\)

Answer 3

\(\dfrac{2}{5}+\dfrac{3}{8}=\dfrac{16}{40}+\dfrac{15}{40}=\dfrac{31}{40}\)

\(\dfrac{8}{9}\cdot\dfrac{7}{5}=\dfrac{56}{45}\)