题目内容
计算(
+
)×28,运用( )计算比较简便.
| 3 |
| 4 |
| 5 |
| 7 |
| A.乘法分配律 | B.乘法交换律 | C.乘法结合律 |
(
+
)×28
=
×28+
×28
=21+20
=41
故选:A.
| 3 |
| 4 |
| 5 |
| 7 |
=
| 3 |
| 4 |
| 5 |
| 7 |
=21+20
=41
故选:A.
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题目内容
| 3 |
| 4 |
| 5 |
| 7 |
| A.乘法分配律 | B.乘法交换律 | C.乘法结合律 |
| 3 |
| 4 |
| 5 |
| 7 |
| 3 |
| 4 |
| 5 |
| 7 |