(2根号2+3)^2005次方乘以(2根号2-3)^2006次方
=(2根号2+3)^2005次方乘以(2根号2-3)^2005次方×(2√2-3)
=[(2根号2+3)乘以(2根号2-3)]^2005次方×(2√2-3)
=[8-9]^2005次方×(2√2-3)
=3-2√2