`\color{#1AD5F7}{@25}\color{#4DA6E6}{nguy}\color{#668EDD}{en}\color{#8077D5}{ngoc}\color{#995FCD}{}\color{#CC2FBC}{kha}\color{#4DA6E6}{n}\color{#EA2F90}{h}`
Ta có:

`\sqrt{1\frac{9}{16}}`

`=\sqrt{\frac{1 xx16+9}{16}}`

`=\sqrt{\frac{25}{16}}`

`=\frac{\sqrt{25}}{\sqrt{16}}`

`= 5/4`