| căn bậc hai 169  - căn bậc hai 900| - | - 5/4| : ( 1/3 - 1/2)^2

Lời giải:

\(\left| {\sqrt {169} - \sqrt {900} } \right| - \left| {\frac{{ - 5}}{4}} \right|:{\left( {\frac{1}{3} - \frac{1}{2}} \right)^2}\)

\( = \left| {13 - 30} \right| - \frac{5}{4}:{\left( {\frac{{ - 1}}{6}} \right)^2}\)

\( = \left| { - 17} \right| - \frac{5}{4}:\frac{1}{{36}}\)

\( = 17 - \frac{5}{4}\,\,.\,\,36\)

= 17 – 5 . 9

= 17 – 45 = –28.