题目内容
计算化简：
+
+
．
| x |
| x2+3x+2 |
| x |
| x2+x-2 |
| 2 |
| 1-x2 |
原式=
+
+
=
+
-
=
=
=
=
．
| x |
| (x+2)(x+1) |
| x |
| (x+2)(x-1) |
| 2 |
| (1+x)(1-x) |
=
| x(x-1) |
| (x+2)(x+1)(x-1) |
| x(x+1) |
| (x+2)(x+1)(x-1) |
| 2(x+2) |
| (x+2)(x+1)(x-1) |
=
| x2-x +x2+x-2x-4 |
| (x+2)(x2-1) |
=
| 2x2-2x-4 |
| (x+2)(x+1)(x-1) |
=
| 2(x-2)(x+1) |
| (x+2)(x+1)(x-1) |
=
| 2x-4 |
| x2+x-2 |
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