Tìm: |−2 022|; | căn bậc hai 312|; | { - căn bậc hai 5,4|; | - 273/2|; |−20,21|.

Lời giải:

Ta có: |−2 022| = −(−2 022)  = 2 022; \(\left| {\sqrt {312} } \right| = \sqrt {312} \);

\(\left| { - \sqrt {5,4} } \right| = - \left( { - \sqrt {5,4} } \right) = \sqrt {5,4} \); \(\left| {\frac{{ - 273}}{2}} \right| = - \left( {\frac{{ - 273}}{2}} \right) = \frac{{273}}{2}\);

|−20,21| = −(−20,21) = 20,21.