题目内容
化简以下各式：
①
+
+
；②
-
+
-
；③
-
+
；④
+
+
-
．其结果为
的个数是______．
①
| AB |
| BC |
| CA |
| AB |
| AC |
| BD |
| CD |
| OA |
| OD |
| AD |
| NQ |
| QP |
| MN |
| MP |
| 0 |
①
+
+
=
+
=
． ②
-
+
-
=
+
-
=
-
=
．
③
-
+
=
+
=
． ④（
+
）+（
-
）=
+
=
．
故答案为：4．
| AB |
| BC |
| CA |
| AC |
| CA |
| 0 |
| AB |
| AC |
| BD |
| CD |
| CB |
| BD |
| CD |
| CD |
| CD |
| 0 |
③
| OA |
| OD |
| AD |
| DA |
| AD |
| 0 |
| NQ |
| QP |
| MN |
| MP |
| NP |
| PN |
| 0 |
故答案为：4．
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