题目内容
下列各题,怎样算简便就怎样算 48×(
|
| ||||||||||||||||
|
(12÷
| ||||||||||||||||
12×(
|
18×(
|
分析:(1)(3)(6)运用乘法分配律解答,
(2)依据除法性质解答,
(4)按照先算括号里面的除法,再算括号里面的加法,最后算括号外面的顺序解答,
(5)按照先算括号里面的,再算括号外面的顺序解答.
(2)依据除法性质解答,
(4)按照先算括号里面的除法,再算括号里面的加法,最后算括号外面的顺序解答,
(5)按照先算括号里面的,再算括号外面的顺序解答.
解答:解:(1)48×(
+
)
=48×
+48×
=6+8
=14;
(2)4÷
÷
=4÷(
×
)
=4÷
=5
;
(3)
×(
-
)
=
×
-
×
=
-
=
;
(4)(12÷
+19)×
=(16+19)×
=35×
=14;
(5)12×(
÷
)
=12×
=9;
(6)18×(
+
-
)
=18×
+18×
-18×
)
=12+2-3
=11.
1 |
8 |
1 |
6 |
=48×
1 |
8 |
1 |
6 |
=6+8
=14;
(2)4÷
5 |
3 |
9 |
20 |
=4÷(
5 |
3 |
9 |
20 |
=4÷
3 |
4 |
=5
1 |
3 |
(3)
3 |
10 |
5 |
7 |
10 |
21 |
=
3 |
10 |
5 |
7 |
3 |
10 |
10 |
21 |
=
3 |
14 |
1 |
7 |
=
1 |
14 |
(4)(12÷
3 |
4 |
2 |
5 |
=(16+19)×
2 |
5 |
=35×
2 |
5 |
=14;
(5)12×(
3 |
5 |
4 |
5 |
=12×
3 |
4 |
=9;
(6)18×(
2 |
3 |
1 |
9 |
1 |
6 |
=18×
2 |
3 |
1 |
9 |
1 |
6 |
=12+2-3
=11.
点评:本题考查知识点:(1)依据四则运算计算方法正确进行计算,(2)运正确用简便方法解决问题.
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