17\18-(1\3+1\18)简便计算5-1\4-2\5-3\45\8+5\7-5\7+5\84\15+5\12+11\15能简便的简便计算

17/18 - (1/3 + 1/18)
= 17/18 - 1/18 - 1/3
= 16/18 - 6/18
= 10/18
= 5/9
5 - 1/4 - 2/5 - 3/4
= 4 + 1 - 2/5 - 4/4
= 4 + 3/5 - 1
= 3 + 3/5
= 3.6
5/8 + 5/7 - 5/7 + 5/8
= 5/8 + 3/8 + 2/8
= 8/8 + 1/4
= 1+ 1/4
= 1.25
4/15 + 5/12 + 11/15
= 15/15 + 5/12
= 1+ 5/12

17/18-(1/3+1/18)
=17/18-1/3-1/18
=17/18-1/18-1/3
=8/9-3/9
=5/9

5-1/4-2/5-3/4
=5-(1/4+3/4)-2/5
=4-2/5
=1又3/5
5/8+5/7-5/7+5/8
=5/8+5/8+(5/7-5/7)
=10/8
=5/4
4/15+5/12+11/15
=4/15+11/15+5/12
=1+5/12
=1又5/12