如题所述
第1个回答 2017-05-21
2/5+2/3-2/5
=(2/5-2/5)+2/3
=0+2/3
=2/3
=(2/5-2/5)+2/3
=0+2/3
=2/3
第2个回答 2023-03-15
=2/5-2/5+2/3
=(2-2)/5+2/3
=0+2/3
=2/3
=(2-2)/5+2/3
=0+2/3
=2/3
第3个回答 2017-05-21
2/5+2/3-2/5
=2/5-2/5+2/3
=0+2/3
=2/3本回答被提问者采纳
=2/5-2/5+2/3
=0+2/3
=2/3本回答被提问者采纳