题目内容
计算:-
a(2a2-4b)=______.
| 3 |
| 2 |
-
a(2a2-4b),
=(-
a)×(2a2)-(-
a)(4b),
=-3a3+6ab.
| 3 |
| 2 |
=(-
| 3 |
| 2 |
| 3 |
| 2 |
=-3a3+6ab.
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下列各式中计算正确的有( )
①
+5
=
;②5
-
=4
;③3
-
=
;④
=
+
.
①
| 2 |
| 3 |
| 2 |
| 2 |
| 17 |
| 3 |
| 2 |
| x |
| x |
| x |
| 2a |
| 8a |
| 2a |
| ||||
| 3 |
| 4 |
| 9 |
| A、①②③④ | B、①②③ |
| C、②③ | D、②④ |