=√3/√7
=√3*√7/√7*√7
=√2 1/7
12 of a branch with 7 roots minus 3/7 roots.
=( 12-3)/√7
=9/√7
=9√7/√7*√7
=9√7/7
You can ask if you don't understand! Satisfied, please adopt it in time! O(∩_∩)O