1、3√2-√2=2√2 2、3√ 1/3+√ 12=3√3

3、√8-√9/2+√ 1/2=√2

The square of (√7+√5) = 12+2√35 (this is calculated).

Square of (√2×√6) = 12 (final calculation)

∵ 12+2√35> 12

∴√7+√5>√2×√6

The square of one number is greater than the square of another.

This number will definitely be larger than that number.

The above reasons are my own expression. The teacher just gave me the right number. The exercise book is at school, and I have forgotten some of these questions. I did it again in the book, and it was ok to make sure it was correct.