26.
The value of $$\frac{1}{{\sqrt {\left( {12 - \sqrt {140} } \right)} }}$$   $$ -\, \frac{1}{{\sqrt {\left( {8 - \sqrt {60} } \right)} }}$$   $$ -\, \frac{2}{{\sqrt {\left( {10 + \sqrt {84} } \right)} }}$$    = is ?

27.
(1000)12 ÷ (10)30 = ?

28.
Simplify : $$\frac{{{{1.5}^3} + {{4.7}^3} + {{3.8}^3} - 3 \times 1.5 \times 4.7 \times 3.8}}{{{{1.5}^2} + {{4.7}^2} + {{3.8}^2} - 1.5 \times 4.7 - 4.7 \times 3.8 - 3.8 \times 1.5}}$$           = ?

29.
Simplify : $$\frac{{0.41 \times 0.41 \times 0.41 + 0.69 \times 0.69 \times 0.69}}{{0.41 \times 0.41 - 0.41 \times 0.69 + 0.69 \times 0.69}} = ?$$

30.
If 310 × 272 = 92 × 3n then the value of n is = ?

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