题目内容
简算.
(1)999999×7+111111×37
(2)24×(
-
)
(3)37×
(4)
×
+
×
+
×
.
(1)999999×7+111111×37
(2)24×(
5 |
12 |
1 |
6 |
(3)37×
35 |
36 |
(4)
5 |
6 |
1 |
13 |
5 |
9 |
2 |
13 |
5 |
18 |
6 |
13 |
分析:(1)999999×7+111111×37,将原式转化为:111111×63+111111×37,运用乘法分配律进行简算;
(2)24×(
-
),运用乘法分配律进行简算;
(3)37×
,将原式转化为:(36+1)×
,再运用乘法分配律进行简算;
(4)
×
+
×
+
×
,首先将原式转化为:
×
+
×
+
×
,再运用乘法分配律进行简算.
(2)24×(
5 |
12 |
1 |
6 |
(3)37×
35 |
36 |
35 |
36 |
(4)
5 |
6 |
1 |
13 |
5 |
9 |
2 |
13 |
5 |
18 |
6 |
13 |
1 |
6 |
5 |
13 |
2 |
9 |
5 |
13 |
6 |
18 |
5 |
13 |
解答:解:(1)999999×7+111111×37,,
=111111×63+111111×37
=111111×(63+37),
=111111×100,
=11111100;
(2)24×(
-
),
=24×
-24×
,
=10-4,
=6;
(3)37×
,
=(36+1)×
,
=36×
+1×
,
=35+
,
=35
;
(4)
×
+
×
+
×
,
=
×
+
×
+
×
,
=(
+
+
)×
,
=
×
,
=
.
=111111×63+111111×37
=111111×(63+37),
=111111×100,
=11111100;
(2)24×(
5 |
12 |
1 |
6 |
=24×
5 |
12 |
1 |
6 |
=10-4,
=6;
(3)37×
35 |
36 |
=(36+1)×
35 |
36 |
=36×
35 |
36 |
35 |
36 |
=35+
35 |
36 |
=35
35 |
36 |
(4)
5 |
6 |
1 |
13 |
5 |
9 |
2 |
13 |
5 |
18 |
6 |
13 |
=
1 |
6 |
5 |
13 |
2 |
9 |
5 |
13 |
6 |
18 |
5 |
13 |
=(
1 |
6 |
2 |
9 |
6 |
18 |
5 |
13 |
=
13 |
18 |
5 |
13 |
=
5 |
18 |
点评:此题考查的目的是运用“转化”的思想与方法,将原式进行转化,然后再运用乘法分配律进行简便计算.
练习册系列答案
相关题目