Question

分数和小数的互化的概念

要全一点儿的

Answer 1

普通小数转为分数,分母为10的次幂即10、100、1000、10000……

0.1=1/10
0.2=2/10=1/5
0.34=34/100
0.987=987/1000
0.125=125/1000=1/8
12.125=12又1/8

无限循环小数转为分数，以9、99、999、9999……为分母，循环节为分子
0.3（3循环）=3/9=1/3
0.28（28循环）=28/99
0.36(6循环)=0.3+0.06（6循环）=1/10+6/90=15/90=1/6

分数转换为小数：做除法，分子为被除数，分母为除数。

Answer 2

分数化小数：分子除以分母，如遇到除不尽时，通常商算到小数第三位，再用四舍五入法取二位小数．同时要注意等号和约等号的使用。
小数化分数：先把小数化成分母是10、100、1000...的分数，然后再化成最简分数。

望采纳

Answer 3

分数集合等于有限小数+无限循环小数

Answer 4

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Answer 5