mmgsp
幼苗
共回答了15个问题采纳率:86.7% 举报
(1)
8
9 +
1
9 ×15,
=
8
9 +
5
3 ,
=
23
9 ;
(2)(
5
12 -
5
18 )×36,
=
5
12 ×36-
5
18 ×36,
=15-10,
=5;
(3)
7
15 ×
8
9 ×
5
21 ,
=
7
15 ×
5
21 ×
8
9 ,
=
1
9 ×
8
9 ,
=
8
81 ;
(4)
7
18 -
4
5 ×
7
18 ,
=
7
18 ×(1-
4
5 ),
=
7
18 ×
1
5 ,
=
7
90 ;
(5)
5
7 ×
2
3 +
5
7 ×
1
3 ,
=
5
7 ×(
2
3 +
1
3 ),
=
5
7 ;
(6)39×
23
38 ,
=(38+1)×
23
38 ,
=38×
23
38 +1×
23
38 ,
=23+
23
38 ,
=23
23
38 ;
(7)
5
14 ×
9
11 +
13
14 ×
5
11 ,
=
5
14 ×
9
11 +
5
14 ×
13
11 ,
=
5
14 ×(
9
11 +
13
11 ),
=
5
14 ×2,
=
5
7 .
1年前
10