5/4*3.5+5.5*80%+4/5 用简便方法计算_数学解答

5/4*3.5+5.5*80%+4/5 用简便方法计算

人气：308 ℃　时间：2020-04-29 08:04:45

解答

5/4*3.5+5.5*80%+4/5
=5/4*3.5+5.5*4/5+4/5
=5/4*3.5+(5.5+1)4/5
=(5/4)(7/2)+(13/2)(4/5)
=35/8+26/5
=175/40+208/40
=383/40