题目内容
计算:
(1)(
+
)÷
.
(2)a3
+3a
-7a3
.
(1)(
| 80 |
| 40 |
| 5 |
(2)a3
| 8a |
| 50a3 |
|
(1)原式=
÷
+
÷
=4+2
;
(2)原式=2a3
+15a2
-7a2
=2a3
+8a2
.
| 80 |
| 5 |
| 40 |
| 5 |
=4+2
| 2 |
(2)原式=2a3
| 2a |
| 2a |
| 2a |
=2a3
| 2a |
| 2a |
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