题目内容
计算：
+
+
+
．
| 1 |
| 1-x |
| 1 |
| 1+x |
| 2 |
| 1+x2 |
| 4 |
| 1+x4 |
原式=
+
+
+
=
+
+
=
+
+
=
+
=
+
=
．
| 1+x |
| (1-x)(1+x) |
| 1-x |
| (1-x)(1+x) |
| 2 |
| 1+x2 |
| 4 |
| 1+x4 |
=
| 2 |
| (1-x)(1+x) |
| 2 |
| 1+x2 |
| 4 |
| 1+x4 |
=
| 2(1+x2) |
| (1-x2)(1+x2) |
| 2(1-x2) |
| (1-x2)(1+x2) |
| 4 |
| 1+x4 |
=
| 4 |
| 1-x4 |
| 4 |
| 1+x4 |
=
| 4(1+x4) |
| (1-x4)(1+x4) |
| 4(1+x4) |
| (1-x4)(1+x4) |
=
| 8 |
| 1-x8 |
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