题目内容
(
+
)÷21=
÷21+
÷21,这是运用了( )
| 4 |
| 7 |
| 1 |
| 3 |
| 4 |
| 7 |
| 1 |
| 3 |
| A.乘法交换律 | B.乘法结合律 | C.乘法分配律 |
(
+
)÷21,
=(
+
)×
,
=
×
+
×
,
=
÷21+
÷21.
符合乘法分配律.
故选:C.
| 4 |
| 7 |
| 1 |
| 3 |
=(
| 4 |
| 7 |
| 1 |
| 3 |
| 1 |
| 21 |
=
| 4 |
| 7 |
| 1 |
| 21 |
| 1 |
| 3 |
| 1 |
| 21 |
=
| 4 |
| 7 |
| 1 |
| 3 |
符合乘法分配律.
故选:C.
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