Simplify and express the result in its simplest form:
         ÷ 3

78 Simplify and express the result in its simplest form:
         x 79 Simplify and express the result in its simplest form:
         x 81 Simplify and express the result in its simplest form: 
         (1) ÷ x
         (2) x x 82 Write the simplest rationalising factor of   
         (i)          (ii)       (iii)         (iv)        (v)