题目内容

用简便算法计算
8
13
÷7+
1
7
×
5
13

2
3
+(
8
7
+
1
2
)×
7
24

8
15
×16-
8
15
(1)
8
13
÷7+
1
7
×
5
13

=
8
13
×
1
7
+
1
7
×
5
13

=(
8
13
+
5
13
)×
1
7

=1×
1
7

=
1
7


(2)
2
3
+(
8
7
+
1
2
)×
7
24

=
2
3
+
23
14
×
7
24

=
2
3
+
23
48

=
55
48


(3)
8
15
×16-
8
15

=
8
15
×(16-1),
=
8
15
×15,
=8.
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