Question

Rút gọn các phân số rồi tính :

72/90 + 7/28

Answer 1

\(\dfrac{4}{5}+\dfrac{1}{4}=\dfrac{21}{20}\)

Answer 2

=4/5+1/4=21/20

Answer 3

\(\dfrac{4}{5}+\dfrac{1}{4}=\dfrac{21}{20}\)

Answer 4

 72/90 + 7/28 = 4/5 + 1/4 =1 và 1/20 

Answer 5

\(\dfrac{4}{5}+\dfrac{1}{4}=\dfrac{21}{20}\)

Answer 6

21 / 20

Answer 7

4/5+1/4=21/20