Question

Nhanh lên nha

Answer 1

\(\dfrac{4}{7}+\dfrac{5}{14}=\dfrac{8}{14}+\dfrac{5}{14}=\dfrac{13}{14}\)

\(\dfrac{7}{8}-\dfrac{4}{3}=\dfrac{21}{24}-\dfrac{32}{24}=\dfrac{-11}{24}\)

\(\dfrac{3}{4}:\dfrac{6}{7}=\dfrac{3}{4}\times\dfrac{7}{6}=\dfrac{7}{8}\)

\(\dfrac{15}{21}\times\dfrac{2}{5}=\dfrac{5}{7}\times\dfrac{2}{5}=\dfrac{2}{7}\)

Answer 2

a: 4/7+5/14=8/14+5/14=13/14

b: 7/8-4/3=21/24-32/24=-11/24

c: \(\dfrac{3}{4}:\dfrac{6}{7}=\dfrac{3}{4}\cdot\dfrac{7}{6}=\dfrac{21}{24}=\dfrac{7}{8}\)

d: \(\dfrac{15}{21}\cdot\dfrac{2}{5}=\dfrac{5}{7}\cdot\dfrac{2}{5}=\dfrac{2}{7}\)

Answer 3

a. 13/14

b. -11/24

c. 7/8

d. 2/7