求k = (x-3)/(x+1)=1- 4/(x+1) 的计算过程,

问题描述:

求k = (x-3)/(x+1)=1- 4/(x+1) 的计算过程,

k=(x-3)/(x+1)
=[(x+1)-4]/(x+1)
=(x+1)/(x+1)-4/(x+1)
=1-4/(x+1)
这过过程叫做分离常数.