先化简代数式:(
|
(
x-1 |
x+1 |
2x |
x2-1 |
1 |
x2-1 |
=(
(x-1)2 |
(x+1)(x-1) |
2x |
x2-1 |
1 |
x2-1 |
=
x2+1 |
x2-1 |
=x2+1;(15分)
当x=0时,原式的值为1.(6分)
说明:只要x≠±1,且代入求值正确,均可记满分(6分).
先化简代数式:(
|
(
x-1 |
x+1 |
2x |
x2-1 |
1 |
x2-1 |
=(
(x-1)2 |
(x+1)(x-1) |
2x |
x2-1 |
1 |
x2-1 |
=
x2+1 |
x2-1 |
=x2+1;(15分)
当x=0时,原式的值为1.(6分)
说明:只要x≠±1,且代入求值正确,均可记满分(6分).