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复习展开式的小数

复习用展开形式表达小数并做一些练习题.

展开形式

数的展开式利用这个数中每一位数的数位表示出该数.
使用数位顺序表可以知道一个数中每一位数的数位.

例题

请写出 start color #11accd, 3, end color #11accd, point, start color #7854ab, 4, end color #7854ab, start color #1fab54, 0, end color #1fab54, start color #ca337c, 5, end color #ca337c 的展开式.
整数.一位小数两位小数三位小数
start color #11accd, 3, end color #11accd.start color #7854ab, 4, end color #7854abstart color #1fab54, 0, end color #1fab54start color #ca337c, 5, end color #ca337c
3, point, 405, equals, start color #11accd, 3, end color #11accd, start text, space, 个, 1, end text plus, start color #7854ab, 4, end color #7854ab, start text, space, 个, 0, point, 1, end text, plus start color #1fab54, 0, end color #1fab54, start text, space, 个, 0, point, 01, end text, plus, start color #ca337c, 5, end color #ca337c, start text, space, 个, 0, point, 001, end text
empty space, equals, left parenthesis, start color #11accd, 3, end color #11accd, times, 1, right parenthesis, plus, left parenthesis, start color #7854ab, 4, end color #7854ab, times, start fraction, 1, divided by, 10, end fraction, right parenthesisplus, left parenthesis, start color #1fab54, 0, end color #1fab54, times, start fraction, 1, divided by, 100, end fraction, right parenthesis, plus, left parenthesis, start color #ca337c, 5, end color #ca337c, times, start fraction, 1, divided by, 1000, end fraction, right parenthesis
empty space, equals, start color #11accd, 3, end color #11accd, plus, start color #7854ab, start fraction, 4, divided by, 10, end fraction, end color #7854ab, plus, start color #1fab54, 0, end color #1fab54, plus, start color #ca337c, start fraction, 5, divided by, 1000, end fraction, end color #ca337c
3, point, 405 的展开式是 start color #11accd, 3, end color #11accd, plus, start color #7854ab, start fraction, 4, divided by, 10, end fraction, end color #7854ab, plus, start color #ca337c, start fraction, 5, divided by, 1000, end fraction, end color #ca337c.
想更多地了解数的展开式,请点击 视频.

练习

问题1
  • 当前
57, point, 142, equals, question mark
选出正确答案:

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