Question

không quy đồng mẫu số,hãy so sánh 2 phân số 19/18 và 18/17

 

Answer 1

-Ta có \(\frac{19}{18}=1+\frac{1}{18}\)
\(\frac{18}{17}=1+\frac{1}{17}\)
Vì \(\frac{1}{18}< \frac{1}{17}\)(=) \(1+\frac{1}{18}< 1+\frac{1}{17}\)(=) \(\frac{19}{18}< \frac{18}{17}\)

Answer 2

ta có \(\frac{19}{18}-1=\frac{1}{18},\frac{18}{17}-1=\frac{1}{17}.\)

\(\frac{1}{18}< \frac{1}{17}\)

=>\(\frac{19}{18}< \frac{18}{17}\)

xong r đó

Answer 3

Ta có : 

\(\frac{19}{18}=\frac{19}{18}-1=\frac{19}{18}-\frac{18}{18}=\frac{1}{18}\)

\(\frac{18}{17}=\frac{18}{17}-1=\frac{18}{17}-\frac{17}{17}=\frac{1}{17}\)

Mà : \(\frac{1}{18}< \frac{1}{17}\)

\(\Rightarrow\frac{19}{18}< \frac{18}{17}\)

Answer 4

\(\frac{19}{18}>\frac{18}{17}\)

Answer 5

19/18>18/17