（1-2）^2 / X-1 — —X+1 X+1..就是（1- X+1分之2）的平方除以X+1分之X-1_数学解答

（1-2）^2 / X-1
— —
X+1 X+1
..
就是（1- X+1分之2）的平方除以X+1分之X-1

人气：300 ℃　时间：2020-05-13 21:58:30

解答

[1-2/(x+1)]^2÷(x-1)/(x+1)
=[1-2/(x+1)]^2*(x+1)/(x-1)
=[(x+1-2)/(x+1)]^2*(x+1)/(x-1)
=[(x-1)/(x+1)]^2*(x+1)/(x-1)
=(x-1)^2/(x+1)^2*(x+1)/(x-1)
=(x-1)/(x+1)