= 18-36√3+36√3

= 18;

Please adopt

If you agree with my answer, please adopt it in time.

~ If you agree with my answer, please click the button "Adopt as Satisfied Answer" in time.

~ ~ friends who ask questions on mobile phones can only be satisfied with the evaluation points in the upper right corner of the client.

~ Your adoption is my motivation.

~~O(∩_∩)O, remember to praise the adoption and help each other.