问题 解答题
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
答案

(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.

单项选择题
多项选择题