题目内容
计算:
(1)
+
+
-
(2)(
-1)2-(
-
)(
+
).
(1)
| 8 |
| 1 |
| 5 |
| 50 |
| 27 |
| 1 |
| 2 |
| 12 |
(2)(
| 3 |
| 3 |
| 2 |
| 3 |
| 2 |
(1)
+
+
-
=2
+
×5
+3
-
×2
=2
+
+3
-
=3
+2
;
(2)(
-1)2-(
-
)(
+
)
=3-2
+1-3+2
=3-2
.
| 8 |
| 1 |
| 5 |
| 50 |
| 27 |
| 1 |
| 2 |
| 12 |
=2
| 2 |
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 2 |
| 3 |
=2
| 2 |
| 2 |
| 3 |
| 3 |
=3
| 2 |
| 3 |
(2)(
| 3 |
| 3 |
| 2 |
| 3 |
| 2 |
=3-2
| 3 |
=3-2
| 3 |
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