化成分数 0.345 0.35 0.345 (45)循环
问题描述:
化成分数 0.345 0.35 0.345 (45)循环
答
0.345
=345/1000
=69/200
0.35
=35/100
=7/20
令a=0.345 (45)循环
则100a=34.545(45)循环
100a-a=34.2
a=34.2/99=19/55