题目内容

用简便方法计算.
44
3
×
3
5
×
5
11

12×(
1
3
+
1
4
)

5
7
×
6
13
+
7
13
×
5
7

31×
19
30

(
1
6
-
1
8
)×48

7
10
×11-
7
10
(1)
44
3
×
3
5
×
5
11

=
44
5
×
5
11

=4;

(2)12×(
1
3
+
1
4
)

=12×
1
3
+12×
1
4

=4+3,
=7;

(3)
5
7
×
6
13
+
7
13
×
5
7

=
5
7
×(
6
13
+
7
13
),
=
5
7
×1,
=
5
7


(4)31×
19
30

=(30+1)×
19
30

=30×
19
30
+1×
19
30

=19+
19
30

=19
19
30



(5)(
1
6
-
1
8
)×48

=
1
6
×48-
1
8
×48,
=8-6,
=2;

(6)
7
10
×11-
7
10

=
7
10
×(11-1),
=
7
10
×10,
=7.
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