题目内容

简便计算.
7
13
×
1
5
×39

45×
1
7
+
6
7
×45

(
2
3
-
1
2
+
1
6
1
24
(1)
7
13
×
1
5
×39,
=(
7
13
×39)×
1
5

=21×
1
5

=
21
5


(2)45×
1
7
+
6
7
×45,
=45×(
1
7
+
6
7
),
=45×1,
=45;

(3)(
2
3
-
1
2
+
1
6
)÷
1
24

=(
2
3
-
1
2
+
1
6
)×24,
=
2
3
×24-
1
2
×24+
1
6
×24,
=16-12+4,
=8.
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