问题 解答题
怎样简便就怎样算.
7
18
×37-
7
18

11
13
×37+73×
11
13
-19×
11
13

24×
51
43
+51×
19
43

69×
13
54
-13×
15
54
答案

(1)

7
18
×37-
7
18

=

7
18
×(37-1),

=

7
18
×36,

=14;

(2)

11
13
×37+73×
11
13
-19×
11
13

=

11
13
×(37+73-19),

=

11
13
×91,

=77;

(3)24×

51
43
+51×
19
43

=24×

51
43
+
51
43
×19,

=(24+19)×

51
43

=43×

51
43

=51;

(4)69×

13
54
-13×
15
54

=23×

13
18
-5×
13
18

=(23-5)×

13
18

=18×

13
18

=13.

单项选择题 A1/A2型题
单项选择题