已知x=84,y=2.56,求x+y-2根號xy/根號x-根號y,

已知x=84,y=2.56,求x+y-2根號xy/根號x-根號y,

x+y-2根號xy/根號x-根號y
=(√x-√y)^2/(√x-√y)
=√x-√y
=√84-√2.56
=2√21-1.6
=9.2+1.6
=10.8
你能明白