题目内容

3
4
-
3
4
÷3+3
3
4
4
1
5
-2
3
5
×
5
12
18÷12
3
5
×2
2
9
÷
1
21
1
5
7
÷12+
2
7
×
1
12
2.4×2
1
12
×
4
25
1
2
3
÷(3
1
2
÷1
1
6
(1)3÷
3
4
-
3
4
÷3+3
3
4

=4-
1
4
+3
3
4

=7
1
2


(2)4
1
5
-2
3
5
×
5
12

=4
1
5
-
13
12

=3
7
60


(3)18÷12
3
5
×2
2
9
÷
1
21

=18×
5
63
×
20
9
×21,
=66
2
3


(4)1
5
7
÷12+
2
7
×
1
12

=1
5
7
×
1
12
+
2
7
×
1
12

=(1
5
7
+
2
7
)×
1
12

=2×
1
12

=
1
6


(5)2.4×2
1
12
×
4
25

=2.4×
25
12
×
4
25

=0.8;

(6)1
2
3
÷(3
1
2
÷1
1
6
),
=1
2
3
÷3,
=
5
9
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