Question

tính

a.2/5+3/4         b.2/7+5/9         c4/7+3/4+2/7

nhanh nhanh giúp mik nha

Answer 1

`a,2/5 + 3/4`

`= 8/20 + 15/20`

`= 23/20`

`b,2/7 + 5/9`

`= 18/63 + 35/63`

`= 53/63`

`c, 4/7 + 3/4 + 2/7`

`= ( 4/7 + 2/7)+3/4`

`= 6/7 + 3/4`

`= 24/28 + 21/28`

`= 45/28`

`@ yl`

Answer 2

\(\dfrac{2}{5}+\dfrac{3}{4}=\dfrac{8}{20}+\dfrac{15}{20}=\dfrac{23}{20}\)

\(\dfrac{2}{7}+\dfrac{5}{9}=\dfrac{18}{63}+\dfrac{35}{63}=\dfrac{53}{63}\)

\(\dfrac{4}{7}+\dfrac{3}{4}+\dfrac{2}{7}= \left(\dfrac{4}{7}+\dfrac{2}{7}\right)+\dfrac{3}{4}=\dfrac{6}{7}+\dfrac{3}{4}=\dfrac{45}{28}\)