衤宁
幼苗
共回答了18个问题采纳率:88.9% 举报
(1)
2
3 +
1
5 +
4
5 +
1
3 ,
=(
2
3 +
1
3 )+(
1
5 +
4
5 ),
=1+1,
=2;
(2)4-(
5
11 +
6
11 ),
=4-1,
=3;
(3)
1
8 ×58+
1
8 ×41+
1
8 ,
=
1
8 ×(58+41+1),
=
1
8 ×100,
=12.5;
(4)
4
5 ÷
4
7 ×
5
4 -
1
2 ,
=
4
5 ×
5
4 ×
7
4 -
1
2 ,
=1×
7
4 -
1
2 ,
=
7
4 -
1
2 ,
=
5
4 ;
(5)6÷
3
10 -
3
10 ÷6,
=20-
1
20 ,
=19
19
20 ;
(6)
3
8 ×[(
1
2 +
2
5 )×
2
3 ],
=
3
8 ×[
9
10 ×
2
3 ],
=
3
8 ×
3
5 ,
=
9
40 .
1年前
1