26.
$$\sqrt {\frac{{16}}{{25}}} \times \sqrt {\frac{?}{{25}}} \times \frac{{16}}{{25}} = \frac{{256}}{{625}}$$

27.
The square root of $$\left( {{{272}^2} - {{128}^2}} \right)$$   is = ?

28.
If $$y = 5{\text{,}}$$   then what is the value of $$10y\sqrt {{y^3} - {y^2}} $$   = ?

29.
$$\sqrt {\frac{{25}}{{81}} - \frac{1}{9}} = ?$$

30.
$${\left[ {{{\left( {\sqrt {81} } \right)}^2}} \right]^2} = {\left( ? \right)^2}$$

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