x2-2xy+y2/x2-y2其中x=√3+1,y=√3-1
问题描述:
x2-2xy+y2/x2-y2其中x=√3+1,y=√3-1
答
x²-2xy+y²/x²-y²
=(x-y)²/(x+y)(x-y)
=(x-y)/(x+y)
=2/2√3
=(√3)/3