Question

6/7+ 7/8 =

4/7 - 11/42 = 

5/3 x 2/7 : 4/9 =

2/11 : 1/3 x 2/5 = 

mik cần bài này gấp 

Answer 1

\(\dfrac{6}{7}+\dfrac{7}{8}=\dfrac{48}{56}+\dfrac{49}{56}=\dfrac{97}{56}\)

\(\dfrac{4}{7}-\dfrac{11}{42}=\dfrac{24}{42}-\dfrac{11}{42}=\dfrac{13}{42}\)

\(\dfrac{5}{3}\times\dfrac{2}{7}:\dfrac{4}{9}=\dfrac{5}{3}\times\dfrac{2}{7}\times\dfrac{9}{4}=\dfrac{15}{14}\)

\(\dfrac{2}{11}:\dfrac{1}{3}\times\dfrac{2}{5}=\dfrac{2}{11}\times3\times\dfrac{2}{5}=\dfrac{12}{55}\)

Answer 2

\(\dfrac{6}{7}+\dfrac{7}{8}=\dfrac{48}{56}+\dfrac{49}{56}=\dfrac{97}{56}\)
 

\(\dfrac{4}{7}-\dfrac{11}{42}=\dfrac{24}{42}-\dfrac{11}{42}=\dfrac{13}{42}\)
 

\(\dfrac{5}{3}\times\dfrac{2}{7}:\dfrac{4}{9}=\dfrac{10}{21}\cdot\dfrac{9}{4}=\dfrac{15}{14}\)
 

\(\dfrac{2}{11}:\dfrac{1}{3}\times\dfrac{2}{5}=\dfrac{2}{11}\times3\times\dfrac{2}{5}=\dfrac{6}{11}\cdot\dfrac{2}{5}=\dfrac{12}{55}\)