(1)60×(
2
5 +
3
4 -
1
2 )
=60×
2
5 +60×
3
4 -60×
1
2
=24+45-30
=39
(2)1-[
1
6 +(
3
4 -
7
12 )]
=1-[
1
6 +
1
6 ]
=1-
1
3
=
2
3
(3)
5
8 ×
11
10 +
3
8 ÷
10
11
=
5
8 ×
11
10 +
3
8 ×
11
10
=(
5
8 +
3
8 )×
11
10
=1×
11
10
=
11
10
(1)60×(
2
5 +
3
4 -
1
2 )
=60×
2
5 +60×
3
4 -60×
1
2
=24+45-30
=39
(2)1-[
1
6 +(
3
4 -
7
12 )]
=1-[
1
6 +
1
6 ]
=1-
1
3
=
2
3
(3)
5
8 ×
11
10 +
3
8 ÷
10
11
=
5
8 ×
11
10 +
3
8 ×
11
10
=(
5
8 +
3
8 )×
11
10
=1×
11
10
=
11
10