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# 乘法交换律介绍

## 比较总数

start color #1fab54, 4, end color #1fab54, times, start color #7854ab, 2, end color #7854ab, equals, start color #e07d10, 8, end color #e07d10start color #7854ab, 2, end color #7854ab, times, start color #1fab54, 4, end color #1fab54, equals, start color #e07d10, 8, end color #e07d10

start color #1fab54, 5, end color #1fab54, times, start color #7854ab, 4, end color #7854ab, equals, start color #e07d10, 20, end color #e07d10
start color #7854ab, 4, end color #7854ab, times, start color #1fab54, 5, end color #1fab54, equals, start color #e07d10, 20, end color #e07d10
start color #1fab54, 5, end color #1fab54, times, start color #7854ab, 4, end color #7854ab, equals, start color #7854ab, 4, end color #7854ab, times, start color #1fab54, 5, end color #1fab54
start color #1fab54, 7, end color #1fab54, times, start color #7854ab, 10, end color #7854ab, equals, start color #e07d10, 70, end color #e07d10
start color #7854ab, 10, end color #7854ab, times, start color #1fab54, 7, end color #1fab54, equals, start color #e07d10, 70, end color #e07d10
start color #1fab54, 7, end color #1fab54, times, start color #7854ab, 10, end color #7854ab, equals, start color #7854ab, 10, end color #7854ab, times, start color #1fab54, 7, end color #1fab54

## 乘法交换律

start color #e07d10, 5, end color #e07d10, times, start color #11accd, 2, end color #11accd, equals, start color #1fab54, 10, end color #1fab54

start color #11accd, 2, end color #11accd, times, start color #e07d10, 5, end color #e07d10, equals, start color #1fab54, 10, end color #1fab54
start color #11accd, 2, end color #11accdstart color #e07d10, 5, end color #e07d10 相乘,改变这两个数的位置没有关系.
start color #e07d10, 5, end color #e07d10, times, start color #11accd, 2, end color #11accd, equals, start color #11accd, 2, end color #11accd, times, start color #e07d10, 5, end color #e07d10

### 练习

8, times, 4, equals

## 乘法交换律有什么用处?

7, times, 2, times, 5 可以分成两步:
7, times, 2, equals, 14
14, times, 5, equals, 70

5, times, 2, equals, 10
10, times, 7, equals, 70

5, times, 3, times, 6, equals