Question

4/9-5/18  3/5x5/7    4/7:2/7

giúp mik với 

Answer 1

4/9-5/18 = 8/18 - 5/18 = 3/18 = 1/6

3/5x5/7 = 3/7

4/7:2/7 = 4/7 x 7/2 = 2

Answer 2

4/9-5/18= 8/18 - 5/18 = 3/18 = 1/6

 3/5x5/7=15/35 = 3/7    

4/7:2/7=4/7 x 7/2 = 4/2 = 2

Answer 3

Answer 4

\(\dfrac{4}{9}-\dfrac{5}{18}=\dfrac{8}{18}-\dfrac{5}{18}=\dfrac{3}{18}=\dfrac{1}{6}\)

\(\dfrac{3}{5}\times\dfrac{5}{7}=\dfrac{3\times5}{5\times7}=\dfrac{3}{7}\)

\(\dfrac{4}{7}:\dfrac{2}{7}=\dfrac{4}{7}\times\dfrac{7}{2}=\dfrac{4\times7}{7\times2}=\dfrac{4}{2}=2\)