怎样简便就怎样算.718×37-7181113×37+73×1113-19×111324×5143+51×194369×1354-13×1554.

问题描述:

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

(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.
答案解析:(1)(2)(3)运用乘法分配律简算;
(4)各项先约分,变成23×
13
18
-5×
13
18
,再运用乘法分配律简算.
考试点:分数的简便计算.

知识点:此题主要考查学生对乘法分配律的灵活运用情况.