roweshan
幼苗
共回答了16个问题采纳率:100% 举报
(1)86×
4
85
=(85+1)×
4
85
=85×
4
85 +
4
85
=4+
4
85
=4
4
85 ;
(2)
2
19 -(
7
13 -
17
19 )-
6
13
=
2
19 -
7
13 +
17
19 -
6
13
=(
2
19 +
17
19 )-(
7
13 +
6
13 )
=1-1
=0;
(3)5÷[(
2
3 +
1
5 )×
1
13 ]
=5÷[
13
15 ×
1
13 ]
=5÷
1
15
=5×15
=75;
(4)
9
32 ÷[
4
3 ×(
1
3 +
1
4 -
1
24 -
1
4 )]
=
9
32 ÷[
4
3 ×(
1
4 -
1
4 +
1
3 -
1
24 )]
=
9
32 ÷[
4
3 ×
7
24 ]
=
9
32 ÷
7
18
=
9
32 ×
18
7
=
81
112 ;
(5)
5
21 ×
8
13 +
5
13 ×
5
21 -
5
21
=
5
21 ×(
8
13 +
5
13 -1)
=
5
21 ×0
=0.
1年前
10