题目内容
解答题
(1)化简 4
+
-
+4
(2)计算 (5+
)(5
-2
).
(1)化简 4
| 5 |
| 45 |
| 8 |
| 2 |
(2)计算 (5+
| 6 |
| 2 |
| 3 |
(1)原式=4
+3
-2
+4
=7
+2
;
(2)原式=5×5
-5×2
+
×5
-
×2
=25
-10
+10
-6
=19
.
| 5 |
| 5 |
| 2 |
| 2 |
=7
| 5 |
| 2 |
(2)原式=5×5
| 2 |
| 3 |
| 6 |
| 2 |
| 6 |
| 3 |
=25
| 2 |
| 3 |
| 3 |
| 2 |
=19
| 2 |
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