sẽ khá là dài:
5/6 x 3/7 + 1/2
= 5/14 + 1/2
= 5/14 + 7/14
= 12/14 = 6/7
1/3 : 1/5 - 1
= 1/3 x 5 - 1
= 5/3 - 3/3
= 2/3
4/3 - 1/2 : 3/2
= 4/3 - 1/2 x 2/3
= 4/3 - 1/3
= 3/3 = 1
a.\(\dfrac{5}{14}\) + \(\dfrac{1}{2}\) = \(\dfrac{6}{7}\)
b.\(\dfrac{5}{3}\) - 1 = \(\dfrac{2}{3}\)
c.\(\dfrac{4}{3}-\dfrac{1}{3}\)=1