如题所述
第1个回答 2013-02-12
2/3+5/4×2/5-5/6
=4/6-5/6+1/2
=-1/6+3/6
=2/6
=1/3
=4/6-5/6+1/2
=-1/6+3/6
=2/6
=1/3
第2个回答 2013-02-13
2/3+2/4-5/6
=4/6+3/6-5/6
=7/6-5/6
=2/6
=1/3
=4/6+3/6-5/6
=7/6-5/6
=2/6
=1/3
第3个回答 2013-02-12
2/3+(5/4)×(2/5)-5/6
=2/3+2-5/6
=2/3+1+1/6
=4/6+6/6+1/6
=11/6本回答被网友采纳
=2/3+2-5/6
=2/3+1+1/6
=4/6+6/6+1/6
=11/6本回答被网友采纳
