Find the rationalising factor of 
= 
= 
× 
= 2´ = 2 × 5(1/5)2 × 5(1/5) × 5(4/5) = 2 × 5 = 10
Hence the required R.F is 5(1/5) =
= 
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÷ 
) 
and 
into surds of the same but smallest order. 
= 2.236 and
= 3.162, evaluate 