①
3
4 +
3
4 ÷
2
9 ×
2
27
=
3
4 +
3
4 ×
9
2 ×
2
27
=
3
4 +
27
8 ×
2
27
=
3
4 +
1
4
=1；
②（3-
5
12 ）×
3
31 -
1
4
=
31
12 ×
3
31 -
1
4
=
1
4 -
1
4
=0；
③6-
3
8 ÷
27
4 -
7
18
=6-
3
8 ×
4
27 -
7
18
=6-
1
18 -
7
18
=5
5
9 ；
④
3
7 ÷
15
4 +
3
4 ×
12
7
=
3
7 ×
4
15 +
3
4 ×
12
7
=
3
7 ×（
4
15 +3）
=
3
7 ×
49
15
=1
2
5 ；
⑤
9
48 ÷
3
4 ÷6
=
9
48 ×
4
3 ×
1
6
=
1
24 ；
⑥[（2-
1
4 ）÷
3
4 ]×
3
4
=[
7
4 ×
4
3 ]×
3
4
=
7
3 ×
3
4
=1
3
4 ．