Question

y=x/(x-1)的图像怎么画？

Answer 1

y=(x-1+1)/(x-1)
=(x-1)/(x-1)+1/(x-1)
=1+1/(x-1)
y-1=1/(x-1)
左加右减，下加上减
所以把y=1/x向右移1个单位，向上移1个单位

Answer 2

应该是〔(m-n)^2-4(m-n)+4〕÷(3n-m)
=(m-n-2)÷(3n-m)
=(m-n-2)/(3n-m)
4个1组放在一起，然后提取公因式
=x^2001(x^3+x^2+x+1)+x^1997(x^3+x^2+x+1)+……+(x^3+x^2+x+1)
=0+0+……+0
=0