题目内容
计算:
(1)(
-
)(
+
);
(2)
-
+
.
(1)(
| 5 |
| 6 |
| 5 |
| 6 |
(2)
| 75 |
|
| 3 |
(1)(
-
)(
+
)
=(
)2-(
)2
=-1;
(2)
-
+
=5
-
+
=
.
| 5 |
| 6 |
| 5 |
| 6 |
=(
| 5 |
| 6 |
=-1;
(2)
| 75 |
|
| 3 |
=5
| 3 |
| 1 |
| 9 |
| 3 |
| 3 |
=
| 53 |
| 9 |
| 3 |
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