21.
93 × 62 ÷ 33 = ?

22.
$$\left({\frac{{2+\sqrt 3}}{{2-\sqrt3}}+ \frac{{2 - \sqrt 3}}{{2 + \sqrt 3}} + \frac{{\sqrt 3 - 1}}{{\sqrt 3 + 1}}} \right)$$      Simplifies to :

23.
The value of $$\sqrt {\frac{{\left( {\sqrt {12} - \sqrt 8 } \right)\left( {\sqrt 3 + \sqrt 2 } \right)}}{{5 + \sqrt {24} }}} $$       is = ?

24.
(19)12 × (19)8 ÷ (19)4 = (19)?

25.
(64)4 ÷ (8)5 = ?

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