发布网友
共2个回答
热心网友
(4/5+1/3)+(1+1/5+2/3)
=1又2/15+1又13/15
=3
(4/5+1/3)+(1+1/5+2/3)
=(4/5+1/5)+1+(1/3+2/3)
=1+1+1
=3
热心网友
4/5+1/3+1+1/5+2/3
=4/5+1/5+1+1/3+2/3
=1+1+1=3
4/5+1/3+1+1/5+2/3
=12/15+5/15+1+3/15+10/15
=(12+5+3+10)/15+1
=2+1
=3