Question

哥哥姐姐们教我一下，拜托了！直接写得数1/7+2/3= 1/2+1/3= 3/4-3/8= 1-7/9= 2-1/6= 2/5+3/5= 5/6-2/3=

4/5+1/6-4/5= 计算下列各题，注意使用简便算法。7/8-5/12+5/6 4/5-(1/6+1/12)

2/5+(3/4+3/5+1/4) 4-8/13-5/13 4/5+(1/5+3/8) 17/20-(5/9-3/20) 回答给20.回答的好在加，信誉！

Answer 1

1/7+2/3=17/21
1/2+1/3=5/6
3/4-3/8=3/8
1-7/9=2/9
2-1/6=11/6
2/5+3/5=1
5/6-2/3=1/6
4/5+1/6-4/5=1/6
7/8-5/12+5/6
=7/8+5/12
=31/24

4/5-(1/6+1/12)
=4/5-1/4
=11/20

2/5+(3/4+3/5+1/4)
=2/5+8/5
=2

4-8/13-5/13
=4-1
=3

4/5+(1/5+3/8)
=1+3/8
=11/8

17/20-(5/9-3/20)
=1-5/*9
4/9
不懂再问我我会说的详细点，祝学习进步！

Answer 2

1/7+2/3= 17/21
1/2+1/3= 5/6
3/4-3/8= 3/8
1-7/9=2/9
2-1/6=11/6
2/5+3/5= 1
5/6-2/3=1/6
4/5+1/6-4/5=4/5-4/5+1/6=1/6

7/8-5/12+5/6 =7/8-(5/12-10/12)=7/8+5/12=31/24
4/5-(1/6+1/12)=4/5-1/4=11/20

2/5+(3/4+3/5+1/4)=2/5+3/5+(3/4+1/4)=1+1=2
4-8/13-5/13 =4-(8/13+5/13)=4-1=3
4/5+(1/5+3/8) =4/5+1/5+3/8=1+3/8=11/8
17/20-(5/9-3/20)=17/20+3/20-5/9=1-5/9=4/9

肯定对 望采纳