题目内容
(1)(4+2
)(4-2
)
(2)a2
+3a
-
.
| 3 |
| 3 |
(2)a2
| 2a |
| 8a3 |
| 18a3 |
(1)原式=42-(2
)2
=16-12
=4;
(2)原式=a2
+6a2
-3a
=(7a2-3a)
.
| 3 |
=16-12
=4;
(2)原式=a2
| 2a |
| 2a |
| 2a |
=(7a2-3a)
| 2a |
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方程
=
的解是( )
| x-2 |
| 2x-3 |
| 2 |
| 3-2x |
| A、x=1.5 | B、x=4 |
| C、x=0 | D、无解 |