Question

[Lê Xuân Phú]

rút gọn rồi so sánh 27/81,57/76,35/84

Answer 1

[Emma]

\(\frac{27}{81}=\frac{27\div27}{81\div27}=\frac{1}{3}\)

\(\frac{57}{76}=\frac{57\div19}{76\div19}=\frac{3}{4}\)

\(\frac{35}{84}=\frac{35\div7}{84\div7}=\frac{5}{12}\)

Ta có:   \(\frac{1}{3};\frac{3}{4};\frac{5}{12}\) 

  \(\frac{1}{3}=\frac{1\times4}{3\times4}=\frac{4}{12}\)    \(;\)\(\frac{3}{4}=\frac{3\times3}{4\times3}=\frac{9}{12}\) \(;\)\(\frac{5}{12}\)

Ta thấy \(\frac{4}{12}< \frac{5}{12}< \frac{9}{12}\)

nên \(\frac{1}{3}< \frac{5}{12}< \frac{3}{4}\)

Answer 2

[nguyentaitue]

Rút gọn phân số

27/81=1/3

57/76=3/4

35/84=5/12

MSC : 12

1/3=4/12

3/4=9/12

5/12=5/12

So Sánh

27/81 < 35/84 < 57/76