已知x=2007,y=2008,求x²-2xy+y²/5x²-4xy÷x+y/5x-4y+x²-y/x
问题描述:
已知x=2007,y=2008,求x²-2xy+y²/5x²-4xy÷x+y/5x-4y+x²-y/x
答
x²-2xy+y²=(x-y)²=(-1)²=1
已知x=2007,y=2008,求x²-2xy+y²/5x²-4xy÷x+y/5x-4y+x²-y/x
x²-2xy+y²=(x-y)²=(-1)²=1