题目内容
计算下面各题.(能简便的就简便)
|
(
|
|
12÷
| ||||||||||||||||||||||||
|
|
(
|
|
分析:(1)(2)(7)运用乘法分配律解答,
(3)(4)运用乘法交换律解答,
(5)运用除法性质即可解答,
(6)按照从左到右顺序计算即可解答,
(8)按照先算括号里面的,再算括号外面的顺序计算即可解答.
(3)(4)运用乘法交换律解答,
(5)运用除法性质即可解答,
(6)按照从左到右顺序计算即可解答,
(8)按照先算括号里面的,再算括号外面的顺序计算即可解答.
解答:解:(1)
×14+
=
×(14+1)
=
×15
=7;
(2)(
+
)÷
=
×2+
×2
=
+
=1
;
(3)
×14×
=
×
×14
=
×14
=2;
(4)12÷
×
=12×
÷
=5÷
=6;
(5)
÷
÷
=
÷(
×
)
=
÷
=49;
(6)
÷
×
=
×
=
;
(7)(
+
)÷
=
÷
=1
;
(8)
×(
-
)
=
×
=
.
| 7 |
| 15 |
| 7 |
| 15 |
=
| 7 |
| 15 |
=
| 7 |
| 15 |
=7;
(2)(
| 7 |
| 12 |
| 1 |
| 24 |
| 1 |
| 2 |
=
| 7 |
| 12 |
| 1 |
| 24 |
=
| 7 |
| 6 |
| 1 |
| 12 |
=1
| 1 |
| 4 |
(3)
| 9 |
| 28 |
| 4 |
| 9 |
=
| 9 |
| 28 |
| 4 |
| 9 |
=
| 1 |
| 7 |
=2;
(4)12÷
| 5 |
| 6 |
| 5 |
| 12 |
=12×
| 5 |
| 12 |
| 5 |
| 6 |
=5÷
| 5 |
| 6 |
=6;
(5)
| 14 |
| 5 |
| 2 |
| 5 |
| 1 |
| 7 |
=
| 14 |
| 5 |
| 2 |
| 5 |
| 1 |
| 7 |
=
| 14 |
| 5 |
| 2 |
| 35 |
=49;
(6)
| 1 |
| 4 |
| 5 |
| 6 |
| 5 |
| 12 |
=
| 3 |
| 10 |
| 5 |
| 12 |
=
| 1 |
| 8 |
(7)(
| 5 |
| 14 |
| 5 |
| 7 |
| 6 |
| 7 |
=
| 15 |
| 14 |
| 6 |
| 7 |
=1
| 1 |
| 4 |
(8)
| 1 |
| 3 |
| 4 |
| 5 |
| 5 |
| 7 |
=
| 1 |
| 3 |
| 3 |
| 35 |
=
| 1 |
| 35 |
点评:本题考查知识点:(1)正确运用简便方法解决问题,(2)依据四则运算计算方法正确进行计算.
练习册系列答案
相关题目