1与4/5的差除以2/5与3/5的和,商是多少?_数学解答

1与4/5的差除以2/5与3/5的和,商是多少?

人气：373 ℃　时间：2020-03-23 12:34:36

解答

(1-4/5) / (2/5+3/5)
=(5/5-4/5) / (2/5+3/5)
=[(5-4)/5]/[(2+3)/5]
=(1/5) / (5/5)
=(1/5) / 1
=1/5