Question

[Nguyễn Thị Mai]

Tính rõ ràng

1/20 + 3/5 =....

4/5 x 20/9 =...

4/5 - 5/8 =...

1/2 : 5/8

Answer 1

[Vô danh]

\(\dfrac{1}{20}+\dfrac{3}{5}=\dfrac{1}{20}+\dfrac{12}{20}=\dfrac{13}{20}\\ \dfrac{4}{5}\times\dfrac{20}{9}=\dfrac{4\times4\times5}{5\times9}=\dfrac{4\times4}{9}=\dfrac{16}{9}\\ \dfrac{4}{5}-\dfrac{5}{8}=\dfrac{32}{40}-\dfrac{2}{40}=\dfrac{7}{40}\\ \dfrac{1}{2}:\dfrac{5}{8}=\dfrac{1}{2}\times\dfrac{8}{5}=\dfrac{4\times2}{2\times5}=\dfrac{4}{5}\)

Answer 2

[Kaito Kid]

13/20

16/9

7/40

1/80