Question

 không quy dong hay so sanh cac phan so sau

a ) 15\26va17\13

b)19\21va 15\23

c)565\565va565565\565565

Answer 1

a) 

 Vì \(\frac{15}{26}< 1;\frac{17}{13}>1\)

=> \(\frac{15}{23}< \frac{17}{13}\)

b) 

Vì \(\frac{19}{21}>\frac{19}{23}>\frac{15}{23}\)

=> \(\frac{19}{21}>\frac{15}{23}\)

C)

 VÌ \(\frac{565}{565}=1;\frac{565565}{565565}=1\)

=> \(\frac{565}{565}=\frac{565565}{565565}\)

Answer 2

a) Chọn phân số trung gian là \(\frac{15}{13}\)

Ta có: \(\frac{15}{26}< \frac{15}{13}< \frac{17}{13}\Rightarrow\frac{15}{26}< \frac{17}{13}\)

b) Chọn phân số trung gian là \(\frac{15}{21}\)

Ta có: \(\frac{19}{21}>\frac{15}{21}>\frac{15}{23}\Rightarrow\frac{19}{21}>\frac{15}{23}\)

c) Ta có: \(\frac{565565}{565565}=\frac{565\times1001}{565\times1001}=\frac{565}{565}\)

\(\Rightarrow\frac{565}{565}=\frac{565565}{565565}\)