问题
解答题
(1)计算:(
(2)先化简:(
|
答案
(1)原式=2-1-4+1=-2;
(2)原式=
x+1-x+1 |
(x+1)(x-1) |
x |
2(x+1)(x-1) |
2 |
(x+1)(x-1) |
2(x+1)(x-1) |
x |
4 |
x |
当x=2时,原式=
4 |
2 |
(1)计算:(
(2)先化简:(
|
(1)原式=2-1-4+1=-2;
(2)原式=
x+1-x+1 |
(x+1)(x-1) |
x |
2(x+1)(x-1) |
2 |
(x+1)(x-1) |
2(x+1)(x-1) |
x |
4 |
x |
当x=2时,原式=
4 |
2 |