Question

[lofichill dreangorcer90]

quy đồng mẫu các phân số sau

a.5/21,3/28,45/-108

Answer 1

[2611]

`MSC: 756`

Có: `5/21=[5.36]/[21.36]=180/756`

      `3/28=[3.27]/[28.27]=81/756`

      `45/[-108]=[-45.7]/[108.7]=[-315]/756`

Answer 2

[Bảo Chu Văn An]

Quy đồng \(\dfrac{5}{21};\dfrac{3}{28};\dfrac{45}{-108}\) 

Chuyển dấu \(\dfrac{45}{-108}=\dfrac{45 . \left(-1\right)}{\left(-108\right) . \left(-1\right)}=-\dfrac{45}{108}\) 

Ta có MSC(21,28,108): 756

\(\dfrac{5}{21}=\dfrac{5 . 36}{21 . 36}=\dfrac{180}{756}\) ; \(\dfrac{3}{28}=\dfrac{3 . 27}{28 . 27}=\dfrac{81}{756}\) ; \(-\dfrac{45}{108}=\dfrac{\left(-45\right) . 7}{108 . 7}=-\dfrac{315}{756}\)