题目内容
化简：①
+
+
=______；②
-
-
=______．③(
-
)-(
-
)=______．
| AB |
| BC |
| CD |
| AB |
| AD |
| DC |
| AB |
| CD |
| AC |
| BD |
①
+
+
=
+
=
，②
-
-
=
-
=
，
③（
-
）-（
-
）=
+
+
-
=
+
-
=
-
=
，
故答案为：
；
；
．
| AB |
| BC |
| CD |
| AC |
| CD |
| AD |
| AB |
| AD |
| DC |
| DB |
| DC |
| CB |
③（
| AB |
| CD |
| AC |
| BD |
| AB |
| BD |
| DC |
| AC |
| AD |
| DC |
| AC |
| AC |
| AC |
| 0 |
故答案为：
| AD |
| CB |
| 0 |
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