Question

bài1

2/5+7/10=

6/7-5/8=

 

Answer 1

\(\dfrac{2}{5}+\dfrac{7}{10}=\dfrac{4}{10}+\dfrac{7}{10}=\dfrac{11}{10}\)

\(\dfrac{48}{56}-\dfrac{35}{56}=\dfrac{13}{56}\)

Answer 2

\(\dfrac{2}{5}+\dfrac{7}{10}=\dfrac{4}{10}+\dfrac{7}{10}=\dfrac{4+7}{10}=\dfrac{11}{10}\)

\(\dfrac{6}{7}-\dfrac{5}{8}=\dfrac{48}{56}-\dfrac{35}{56}=\dfrac{48-35}{56}=\dfrac{13}{56}\)

Answer 3

11/10

13/56

Answer 4

a,11/10

b, 13/56