Rationalise the denominator of the following : (i) 3/4√5 (ii) 5√7/√3 (iii) 3/4 − √7 (iv) 17/3√2 + 1 (v) 16/√41 − 5 (vi) 1/√7 − √6 (vii) 1/√5 + √2 (viii) √2 + √3/√2 − √3