5/6-4/9+1/6-2/9
=5/6+1/6-4/9-2/9
=1-6/9
=3/9
=1/3
13/15-7/112/15+6/11
这个题你输错了吧
应该是 13/15-7/11+2/15+6/11
=13/15+2/15-7/11+6/11
=1-1/11
=10/11
7/15-1/4+8/15-3/4
=7/15+8/15-1/4-3/4
=1-1
=0
11/12-1/18+5/12-17/18
=11/12+5/12-1/18-17/18
=16/12-1
=4/12
=1/3
0.7+11/15-3/10+4/15
=7/10-3/10+11/15+4/15
=4/10+1
=1.4
简便计算:
5/6-4/9+1/6-2/9
=(5/6+1/6)-(4/9+2/9)
=1-2/3
=1/3
13/15-7/11+2/15+6/11
=(13/15+2/15)-(7/11-6/11)
=1-1/11
=10/11
7/15-1/4+8/15-3/4
=(7/15+8/15)-(1/4+3/4)
=1-1
=0
11/12-1/18+5/12-17/18
=(11/12+5/12)-(1/18+17/18)
=4/3-1
=1/3
0.7+11/15-3/10+4/15
=7/10+11/15-3/10+4/15
=(7/10-3/10)+(11/15+4/15)
=2/5+1
=1又2/5
(望采纳,谢谢)