Question

a=(căn 15-2 căn 3)mũ 2 +12 căn 5

Answer 1

Đề bài :\(a=\left(\sqrt{15}-2\sqrt{3}\right)^2+12\sqrt{5}\)

=\(15-4\sqrt{45}+\left(2\sqrt{3}\right)^2+12\sqrt{5}\)

=\(15-12\sqrt{5}+12+12\sqrt{5}\)

=27