问题 解答题
下面各题怎样算简便就怎样算
5
7
×16-2÷
7
5
12
13
×(
5
2
-
1
3
3
7
+
3
5
)×7+
4
5
答案

(1)

5
7
×16-2÷
7
5

=

5
7
×16-2×
5
7

=

5
7
×(16-2),

=

5
7
×14,

=10;

(2)

12
13
×(
5
2
-
1
3
),

=

12
13
×
5
2
-
12
13
×
1
3

=

30
13
-
4
13

=2;

(3)(

3
7
+
3
5
)×7+
4
5

=7×

3
7
+
3
5
×7+
4
5

=3+

21
5
+
4
5

=3+(

21
5
+
4
5
),

=3+5,

=8.

单项选择题
单项选择题 A1/A2型题