题目内容
计算:
|
|
| ||||||||||||||||||
28-[(
| (
| (
|
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)首先计算小括号里面的,然后计算小括号外面的即可;
(2)根据减法的性质简算即可;
(3)(6)首先计算小括号里面的,然后从左向右依次计算即可;
(4)首先计算小括号里面的,然后计算中括号里面的,最后计算中括号外面的即可;
(5)首先乘法分配律简算即可.
(2)根据减法的性质简算即可;
(3)(6)首先计算小括号里面的,然后从左向右依次计算即可;
(4)首先计算小括号里面的,然后计算中括号里面的,最后计算中括号外面的即可;
(5)首先乘法分配律简算即可.
解答:
解:(1)
×(
+
)
=
×
=
(2)
÷(3-
-
)
=
÷[3-(
+
)]
=
÷[3-1]
=
÷2
=
(3)
×(
+
)÷6
=
×
÷6
=
(4)28-[(
-
)×2]
=28-[
×2]
=28-
=27
(5)(
-
)×
=
×
-
×
=1-
=
(6)(
+
)×5÷
=
×5×5
=21
| 1 |
| 15 |
| 1 |
| 3 |
| 1 |
| 12 |
=
| 1 |
| 15 |
| 5 |
| 12 |
=
| 1 |
| 36 |
(2)
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
=
| 1 |
| 8 |
(3)
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
| 15 |
=
| 8 |
| 3 |
| 4 |
| 3 |
=
| 16 |
| 27 |
(4)28-[(
| 2 |
| 3 |
| 4 |
| 7 |
=28-[
| 2 |
| 21 |
=28-
| 4 |
| 21 |
=27
| 17 |
| 21 |
(5)(
| 3 |
| 5 |
| 1 |
| 2 |
| 5 |
| 3 |
=
| 3 |
| 5 |
| 5 |
| 3 |
| 1 |
| 2 |
| 5 |
| 3 |
=1-
| 5 |
| 6 |
=
| 1 |
| 6 |
(6)(
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 13 |
| 15 |
=21
| 2 |
| 3 |
点评:此题主要考查了整数、分数四则混合运算,注意运算顺序,注意乘法运算定律、减法的性质的应用.
练习册系列答案
相关题目