来源:学生作业帮 编辑:大师作文网作业帮 分类:综合作业 时间:2024/09/29 13:22:39
①
4
5+(
1
5+
3
4×
4
7),
=
4
5+(
1
5+
3
7),
=(
4
5+
1
5)+
3
7,
=1+
3
7,
=1
3
7;
②
5
14÷[
6
7×(
2
3+
1
6)],
=
5
14÷[
6
7×
2
3+
1
6×
6
7],
=
5
14÷[
4
7+
1
7],
=
5
14×
7
5,
=
1
2;
③(
2
3-
1
4)÷
5
6,
=(
2
3-
1
4)×
6
5,
=
2
3×
6
5−
1
4×
6
5,
=
4
5−
3
10,
=
1
2;
④
8
13÷7+
1
7×
6
13,
=
8
13×
1
7+
1
7×
6
13,
=(
8
13+
6
13)×
1
7,
=
14
13×
1
7,
=
2
13.