题目内容

5
7
×
1
4
+
3
4
×
5
7
(13+
1
9
)×
9
13
66
13
×12+
66
13
4
5
×
3
8
×
5
9
8
3
×(
1
3
-
8
21
×
8
16
9
10
×11-
9
10
1
7
×34×7×
2
17
1
3
+
4
7
+
2
3
+
1
7
6
47
×48.
(1)
5
7
×
1
4
+
3
4
×
5
7

=(
1
4
+
3
4
)×
5
7

=1×
5
7

=
5
7


(2)(13+
1
9
)×
9
13

=13×
9
13
+
1
9
×
9
13

=9+
1
13

=9
1
13


(3)
66
13
×12+
66
13

=(12+1)×
66
13

=13×
66
13

=66;

(4)
4
5
×
3
8
×
5
9

=
3
10
×
5
9

=
1
6



(5)
8
3
×(
1
3
-
8
21
×
8
16
),
=
8
3
×(
1
3
-
8
42
),
=
8
3
×
1
7

=
8
21


(6)
9
10
×11-
9
10

=(11-1)×
9
10

=10×
9
10

=9;

(7)
1
7
×34×7×
2
17

=(
1
7
×
7)×(34×
2
17
),
=1×4,
=4;

(8)
1
3
+
4
7
+
2
3
+
1
7

=(
1
3
+
2
3
)+(
4
7
+
1
7
),
=1+
5
7

=1
5
7


(9)
6
47
×48,
=
6
47
×
47+
6
47
×
1,
=6+
6
47

=6
6
47
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