问题
解答题
先化简(
|
答案
原式=
x-1+x+1 |
(x+1)(x-1) |
(x-1)(x+3) |
x(x+3) |
=
2x |
(x+1)(x-1) |
(x-1)(x+3) |
x(x+3) |
=
2 |
x+1 |
又∵x+1≠0,x-1≠0,x≠0,x+3≠0,
∴x≠-1,1,0,-3,(5分)
取x=2,原式=
2 |
3 |
先化简(
|
原式=
x-1+x+1 |
(x+1)(x-1) |
(x-1)(x+3) |
x(x+3) |
=
2x |
(x+1)(x-1) |
(x-1)(x+3) |
x(x+3) |
=
2 |
x+1 |
又∵x+1≠0,x-1≠0,x≠0,x+3≠0,
∴x≠-1,1,0,-3,(5分)
取x=2,原式=
2 |
3 |