Question

Q11... Simply the following

Answer 1

first we would rationalise all the denominators
.....is given to write the numbers yourself
after rationalizing their denominators you will get:
1-root2/-1+root2-root3/-1+root3-root4/-1+root4-root5/-1+root5-root6/-1+root6-root7/-1+root7-root8/-1+root8-root9/-1
= -1+root2-root2+root3-root3+root4-root4+root5-root5+root6-root6+root7-root7+root8-root8+root9                                             (negative sign in the   denominator would come up in the numerator and the signs will change)
= -1+0+root9
= 3-1
=2