问题 解答题
递等式计算.(能用简便方法的要用简便方法计算)
3
8
×
11
14
+
3
14
×
3
8
4
9
+
3
11
+
5
9
+
1
11
5
7
×
14
15
×
10
21
101×
3
8
-
3
8
5
51
×52
2
9
×51×9×
12
17
答案

(1)

3
8
×
11
14
+
3
14
×
3
8

=(

11
14
+
3
14
)×
3
8

=1×

3
8

=

3
8

(2)

4
9
+
3
11
+
5
9
+
1
11

=(

4
9
+
5
9
)+(
3
11
+
1
11

=1+

4
11

=1

4
11

(3)

5
7
×
14
15
×
10
21
=
20
63

(4)101×

3
8
-
3
8

=(101-1)×

3
8

=100×

3
8

=

75
2

(5)

5
51
×52

=

5
51
×(51+1)

=

5
51
×51+
5
51

=5+

5
51

=5

5
51

(6)

2
9
×51×9×
12
17

=(

2
9
×9)×(51×
12
17

=2×36

=72.

单项选择题
单项选择题