1与4/5的差除以2/5与3/5的和,商是多少?

问题描述:

1与4/5的差除以2/5与3/5的和,商是多少?

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

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

(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

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