bxh2536
幼苗
共回答了17个问题采纳率:94.1% 举报
(1)
4
5 +(
3
8 -
1
4 ),
=
4
5 +
1
8 ,
=
37
40 ;
(2)2-
3
7 -
4
7 ,
=2-(
3
7 +
4
7 ),
=2-1,
=1;
(3)
5
8 -
1
3 +
5
12 ,
=
7
24 +
5
12 ,
=
17
24 ;
(4)
2
9 +
9
17 +
7
9 +
8
17 ,
=(
2
9 +
7
9 )+(
9
17 +
8
17 ),
=1+1,
=2;
(5)
5
12 -(
1
2 -
1
12 ),
=
5
12 -
1
2 +
1
12 ,
=
5
12 +
1
12 -
1
2 ,
=
1
2 -
1
2 ,
=0;
(6)
4
5 -(
7
15 -
4
9 ),
=
4
5 -
7
15 +
4
9 ,
=
1
3 +
4
9 ,
=
7
9 .
1年前
2