Question

[o0o I am a studious person o0o]

So sánh 2 căn thức sau :

 \(\sqrt{\frac{81}{25}-\frac{2}{7}}\)và \(\frac{9}{5}-\frac{2}{7}\)

Admin giúp em nha

Answer 1

[o0o I am a studious person o0o]

Ta có : \(\sqrt{\frac{81}{25}-\frac{2}{7}}< \sqrt{\frac{81}{25}}\)

\(\Rightarrow\sqrt{\frac{81}{25}-\frac{2}{7}}>\sqrt{\frac{81}{25}}-\frac{2}{7}\)

\(\Rightarrow\sqrt{\frac{81}{25}-\frac{2}{7}}>\frac{9}{5}-\frac{2}{7}\)