题目内容
小斌的作业本以下四题:①
=
•
=6;②
•
=
;③
=
•
=3;④
-
=
;其中计算正确的是( )
| (-4)(-9) |
| -4 |
| -9 |
| 2 |
| 3 |
| 6 |
| 52-42 |
| 5+4 |
| 5-4 |
| 4 |
| 2 |
| 2 |
| A.1个 | B.2个 | C.3个 | D.4个 |
①
=
=
×
=6,本选项错误;
②
•
=
=
,本选项正确;
③
=
•
=
×1=3,本选项正确;
④
-
=2-
,本选项错误;
正确的有2个,故选B.
| (-4)•(-9) |
| 4×9 |
| 4 |
| 9 |
②
| 2 |
| 3 |
| 2×3 |
| 6 |
③
| 52-42 |
| 5+4 |
| 5-4 |
| 9 |
④
| 4 |
| 2 |
| 2 |
正确的有2个,故选B.
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