bing_271
幼苗
共回答了13个问题采纳率:84.6% 举报
① (
1
3 +
1
12 -
1
6 )×24
=
1
3 ×24+
1
12 ×24-
1
6 ×24,
=8+2-4,
=6;
②
4
5 ×
2
3 +
1
5 ÷
3
4
=
8
15 +
1
5 ×
4
3 ,
=
8
15 +
4
15 ,
=
4
5 ;
③
2
7 ×
8
9 +
5
7 ×
8
9
=(
2
7 +
5
7 )×
8
9 ,
=1×
8
9 ,
=
8
9 ;
④ (9.5+
3
5 )-(2.8-
2
5 )
=(9.5+0.6)-(2.8-0.4),
=10.1-2.4,
=7.7;
⑤ [
1
2 -(
3
4 -
3
5 )]÷
7
10
=[
1
2 -(
15
20 -
12
20 )]×
10
7 ,
=[
10
20 -
3
20 ]×
10
7 ,
=
7
20 ×
10
7 ,
=
1
2 ;
⑥(
5
7 +
5
8 )×
2
5
=
5
7 ×
2
5 +
5
8 ×
2
5 ,
=
2
7 +
1
4 ,
=
8
28 +
7
28 ,
=
15
28 .
1年前
2