题干
若
=
+
，求M，N的值．
| 1 |
| 3 |
| x |
| x |
| 2 |
| 1 |
| M |
| x |
| + |
| 1 |
| N |
| x |
| 1 |
答案(点此获取答案解析）
解：已知等式整理得：
=
| 1 |
| − |
| 3 |
| x |
| x |
| 2 |
| − |
| 1 |
=0.047”，在 