Question

[Cảm ơn ai đã giải bài hộ mình ạ]

 Quy đồng mẫu số sau:  20/45 ; 14/35 ; 32/44

Answer 1

[HT.Phong (9A5)]

Ta có:

\(\dfrac{20}{45}=\dfrac{5}{9}\)

\(\dfrac{14}{35}=\dfrac{2}{5}\)

\(\dfrac{32}{44}=\dfrac{8}{11}\) 

Mẫu số chung là:  495

\(\dfrac{5}{9}=\dfrac{5\cdot55}{9\cdot55}=\dfrac{275}{495}\)

\(\dfrac{2}{5}=\dfrac{2\cdot99}{5\cdot99}=\dfrac{198}{495}\)

\(\dfrac{8}{11}=\dfrac{8\cdot45}{11\cdot45}=\dfrac{360}{495}\)

Answer 2

[Nguyễn Thị Thương Hoài]

 \(\dfrac{20}{45}\) = \(\dfrac{4}{9}\) = \(\dfrac{4.5.11}{9.5.11}\) = \(\dfrac{220}{495}\)

 \(\dfrac{14}{35}\) = \(\dfrac{2}{5}\) = \(\dfrac{2.9.11}{9.5.11}\) = \(\dfrac{198}{495}\)

  \(\dfrac{32}{44}\) = \(\dfrac{8}{11}\) = \(\dfrac{8.9.5}{9.5.11}\)= \(\dfrac{360}{495}\)