问题 解答题
怎样算简便怎样算.
(1)
7
19
×
25
33
+
32
33
×
7
19

(2)(
1
3
+
1
9
)×
27
28
答案

(1)

7
19
×
25
33
+
32
33
×
7
19

=(

25
33
+
32
33
)×
7
19

=

57
33
×
7
19

=

7
11

(2)(

1
3
+
1
9
)×
27
28

=

1
3
×
27
28
+
1
9
×
27
28

=

9
28
+
3
28

=

3
7

单项选择题 A1/A2型题
判断题