题目内容

脱式计算.(能简算的要简算)
3
5
×
7
12
-
1
5
×
7
12
12×(
1
2
-
3
8
)
10
7
÷
5
8
×
9
4
1-(
7
8
-
2
5
)÷
10
9
35
36
×35
4
9
÷(
1
3
+
1
2
)×
3
5
.
(1)
3
5
×
7
12
-
1
5
×
7
12

=(
3
5
-
1
5
)×
7
12

=
2
5
×
7
12

=
7
30
;

(2)12×(
1
2
-
3
8
)
=12×
1
2
-12×
3
8

=6-
9
2

=
3
2
;

(3)
10
7
÷
5
8
×
9
4

=
16
7
×
9
4

=
36
7
;

(4)1-(
7
8
-
2
5
)÷
10
9

=1-
19
40
÷
10
9

=1-
171
400

=
229
400
;

(5)
35
36
×35
=
35
36
×(36-1)
=
35
36
×36-1×
35
36

=35-
35
36

=34
1
36
;

(6)
4
9
÷(
1
3
+
1
2
)×
3
5

=
4
9
÷
5
6
×
3
5

=
8
15
×
3
5

=
8
25
.
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