Question

[Phạm Gia Khôi]

Quy dong mau so cac phan so a.2/5va 3/10,b.7/24va 3/4.c 16/56 va 5/7

Answer 1

[456]

\(a,\dfrac{2}{5}\) và \(\dfrac{3}{10}\)

Vì \(5:5=1;10:5=2\) nên \(\Rightarrow MSC=10\)

Ta có:

\(\dfrac{2}{5}=\dfrac{2\times2}{5\times2}=\dfrac{4}{10}\)

\(b,\dfrac{7}{24}\) và \(\dfrac{3}{4}\)

Vì `24 : 4 = 6 ; 4 : 4 = 1` nên \(\Rightarrow MSC=24\)

Ta có:

\(\dfrac{3}{4}=\dfrac{3\times6}{4\times6}=\dfrac{18}{24}\)

 \(c,\dfrac{16}{56}\)và \(\dfrac{5}{7}\)

Vì \(7:7=1;56:7=8\) nên \(\Rightarrow MSC=56\)

Ta có:

\(\dfrac{5}{7}=\dfrac{5\times8}{7\times8}=\dfrac{40}{56}\)